The Levenhuk Blaze line is a high-quality entry-level spotting scope, ideal for observations in the city and outdoors. All models in this series are compact and light in weight, making them easy to take with you. Excellent, coated optics made from BK-7 borosilicate glass produce a bright and clear picture with accurate color rendition. Levenhuk Blaze spotting scopes are produced in durable polycarbonate cases.

The Levenhuk Blaze BASE line consists of reliable and easy-to-use spotting scopes with fixed and continuously variable magnification. Included in each package optical device Includes a metal tabletop tripod and a case for transport and storage. Levenhuk Blaze BASE is an excellent choice for observing wildlife and urban landscapes.

The continuation of this series is Levenhuk Blaze PLUS pipes – advanced all-weather optical instruments with improved performance characteristics. Distinctive feature This series features professional optics: prisms and lenses are coated with a special anti-reflective coating, each model is equipped with a removable metal eyepiece of the highest quality. Another feature is waterproof casings, which allow the use of Levenhuk Blaze PLUS pipes in difficult weather conditions. Even in rain and snow, the picture will remain clear and sharp. Levenhuk Blaze PLUS series is created for real hunters, explorers and adventure lovers - everyone who is not afraid of difficulties, bad weather and extreme conditions. All models are supplied with metal tabletop tripods to ensure a stable position for the device.

Levenhuk Blaze PRO spotting scopes are designed for those who are looking for a professional-level optical instrument. They feature an improved optical design that reduces light loss and produces sharper, clearer images in low-light conditions. And it combines harmoniously with a durable and all-weather housing. Even the “junior” models in the series provide impressive magnification, which is rarely seen in optical devices in this price segment. Levenhuk Blaze PRO spotting scopes are an excellent choice for observing nature, exploring urban landscapes, and hunting. Their main features: continuously variable magnification, coated optics made of BK-7 glass, sealed design, nitrogen filling, removable eyepiece, table tripod included.

Levenhuk Blaze Compact – ultra-compact spotting scopes with pancratic lenses. The magnification of the optics can be smoothly changed to switch from far to near and back. All optical elements are made of BK-7 glass and coated to provide the brightest and most color-saturated images. The telescopes are protected from water penetration and filled with nitrogen. If necessary, they can be mounted on a tripod.

Levenhuk Blaze Compact ED spotting scopes are a continuation of the Blaze Compact line, which will be of interest to demanding users. Coated lenses made of low-dispersion ED glass are installed inside the pipes, which significantly reduce chromatism and make the transmitted image clearer and more realistic. These spotting scopes are compact, lightweight, and convenient to use while traveling or hiking. They are waterproof and nitrogen filled. It is possible to install it on a tripod.

The online store “Four Eyes” presents a wide range of spotting scopes and other brands. You can select and buy a spotting scope in our catalog.

ATTENTION:
Don't look at the Sun through a telescope! This may cause permanent damage to your vision.

The bottomless starry sky has always attracted us. Far from city lights, countless scatterings of stars themselves already make an indelible impression, but, alas, the capabilities of human eyes are very limited. Therefore, every astronomy lover quickly comes to the conclusion: in order to see more, a telescope is simply necessary. It may be small, but it will already be possible to see details of the lunar surface, the satellites of Jupiter and even the rings of Saturn, open star clusters and some deep space objects.

How to choose your first telescope?

But the process of choosing a first telescope often turns out to be difficult for a novice observer: the huge assortment in specialized stores literally makes one’s eyes run wide. And although there are no universal telescopes, based on many years of experience of domestic and foreign astronomy enthusiasts, in most cases the ideal first telescope is a small refractor on a simple azimuthal mount. Such devices are easy to use, reliable and do not require any maintenance; they can be used with equal success both for astronomical observations and for viewing ground-based objects. These are the telescopes included in the series Levenhuk Strike NG. It includes three models Levenhuk Strike 50 NG, Levenhuk Strike 60 NG and Levenhuk Strike 80 NG with lenses with diameters of 50, 60 and 80 mm, respectively.

Levenhuk Strike NG series of telescopes for beginner astronomers

This series was developed and produced by Levenhuk specifically for beginner astronomers who are making their first observations and are just getting used to using a telescope. The scope of delivery of telescopes in the series includes everything necessary for observations: inside the colorful box, in addition to the telescope itself, you will find two eyepieces, a Barlow lens, a compass, a moving star map, a CD with a computer planetarium program, as well as a book for novice observers “See everything” !

Features of telescope designs

All telescopes in the series Levenhuk Strike NG differ high quality Made and treated with care, they will serve you for many years. Their lenses are made of high-quality optical glass and have a multi-layer anti-reflective coating applied to them. Thanks to its lightness and compactness (the older model Levenhuk Strike 80 NG weighs less than 5 kilograms, the younger models are even lighter), transporting the telescope is not a hassle and it can be used as a lightweight travel tool. It is worth taking a telescope with you, even if you go outdoors during the day: when using a diagonal mirror, it gives a direct mirror image and can be used to observe distant terrestrial objects.

Telescopes Levenhuk Strike NG are equipped with red dot finders, which allow you to quickly target objects visible to the naked eye (the Moon, planets, bright stars). The telescope tubes are painted white - a kind of classic coloring for astronomical instruments, thanks to which they are clearly visible at dusk and even in the darkness of night, and during the day they do not heat up so much in the sun. The telescope tube is mounted on the mount in just a few seconds, so preparing for observations does not require much time. The tripods of the mounts are equipped with convenient tables for accessories, on which you can place a star chart or an unused eyepiece during observations.

Levenhuk Strike 50 NG and 60 NG telescopes

Let's look at how different models of telescopes in this series differ from each other. and - younger models with lenses with a diameter of 50 mm and 60 mm, the lightest and most compact, but at the same time they have very modest capabilities. The fact is that main characteristic It is not the magnification of a telescope, but the diameter of the lens - the larger it is, the more you can see through this telescope. Another drawback is the focuser for 0.96-inch eyepieces, which limits the choice of additional eyepieces and does not allow the telescope to be used as a photographic lens. These models should be chosen by those for whom the dimensions and light weight of the telescope play a decisive role - such a device will not be a burden and will not take up much space in your luggage.

To clearly illustrate the capabilities of the telescopes in the series, let’s see how you can see the same double star in each of them. In the picture in the white square, from left to right: senior, middle, junior.

Levenhuk Strike 80 NG Telescope

The older model in the series with an 80mm lens that provides high image quality. In addition, this telescope has a 1.25-inch focuser, so it can be easily equipped with almost any eyepieces - their range is simply huge. In addition, you can attach to it digital camera for direct focus shooting. Of course, you shouldn't count on being able to get beautiful pictures nebulae using this telescope, but getting successful photographs of the Moon or terrestrial objects is quite possible.

Therefore, if possible, you should opt for the older model: although it is a little heavier, its capabilities compensate for this disadvantage. The main characteristics of telescopes are given in the summary table at the end of the article.

Moon and mobile tower via Levenhuk Strike 80 NG

Any of the telescopes in the series Levenhuk Strike NG It will be an excellent gift for both adults and children. This is an excellent choice for getting to know the starry sky: reliable and easy to use, it will open you to a new world of celestial bodies and allow you to acquire the necessary skills and experience. And then, if you buy yourself a large telescope to see even more, you will no longer have to learn how to work with it - you will know how and where to look and what you can see there.

Comparative characteristics of Levenhuk Strike NG telescopes

multilayer

The telescope model is an entry-level long-focus f/9 achromatic refractor. The optical parameters of the device and a full set of accessories will allow you to conduct interesting ground-based and astronomical observations. An illustrated reference book and the Stellarium computer planetarium will help the novice astronomer create an observation plan and find the desired object in the night sky.

Available for study are constellations and double stars with a resolution of 1.75 arcseconds, lunar mountains and 6-kilometer craters, phases of Mercury, the Cassini gap and the satellite of Satron, Iapetus, changes in the atmospheric flows of Jupiter, and during oppositions - the polar caps on Mars.

Basic parameters of the Levenhuk Strike 80 NG telescope

• Achromatic refractor with multi-layer coating of optical surfaces
• Relative aperture 1:9
• Compensation for spherical aberrations, coma and primary position chromatism
• Accessory mounting diameter – 0.965 inches (24.5 mm)
• Stainless steel tripod with height adjustment in the range of 63-108 cm, shelf for accessories
• Azimuth fork mount with fine movement mechanism

Description of the Levenhuk Strike 80 NG refractor

The telescope is mounted on an alt-azimuth fork mount with manual control. Aiming is accomplished using a 3x20 optical finder mounted on the tube using a dovetail mount. The two-section steel tripod is adjustable in height and can be quickly set to a comfortable position. Complete accessories are placed on the shelf.

A practical guide to a telescope is an illustrated reference book “You have a telescope. What to do next?”, which contains detailed descriptions and star maps with images of unique celestial objects. Interesting information is also contained on posters with images, characteristics and detailed description the largest stars, the Moon, the Sun and planets of the solar system,

The 3D planetarium program Stellarium will show the planets of the Solar System and more than 600 thousand stars and nebulae in the Milky Way. Software recreates a panoramic image of the starry sky in real time, and allows you to watch sunsets and sunrises, eclipses and comets without leaving your home. A compass and planisphere will help you manually, without the help of gadgets or a computer, determine the current location of the observer and show the constellations that are available for study at the current time of year at a certain latitude

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Levenhuk Strike 80 NG Telescope

Refractor-achromat. Lens diameter: 80 mm. Focal length: 720 mm

Article: 29270

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• Levenhuk
• China for Levenhuk, Inc. (USA)
• lifelong
• 7.0 kg
• 86.0×36.0×16.0 cm.

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• Description
• Characteristics
• Add. materials
• Questions and answers (171)
• Reviews and testimonials (9)

The senior model of the Levenhuk Strike 80 NG series has great optical capabilities. This is an achromatic refractor on a lightweight alt-azimuth mount that is well suited for beginner astronomers of any age. Thanks to its unparalleled rich set of equipment, which includes everything necessary for carrying out observations, this telescope will be an excellent gift for an inquisitive teenager. With its help, you can see many details on the lunar surface (craters and other surface features larger than 5 kilometers), see the rings of Saturn, cloud belts and satellites of Jupiter, phases of Venus, bright comets, nebulae and galaxies, many star clusters and other interesting objects.

The Levenhuk Strike 80 NG telescope is suitable for beginner observers of all ages. A convenient finder with a red dot is installed on the telescope tube, with which pointing at objects does not take much time. Unlike the younger models in the series, this telescope is equipped with a rack-and-pinion focuser of the common 1.25” standard. This allows you to use it a large number of additional accessories (including a T-adapter for connecting SLR camera). The telescope is mounted on a lightweight alt-azimuth mount, which has a soft and smooth move. For ease of guidance along the vertical axis, the mount is equipped with a micrometric screw. It is installed on a two-section metal tripod of adjustable height, thanks to which even a child can reach the telescope eyepiece. The tripod is equipped with a shelf for accessories.

Levenhuk Strike NG telescopes are a series of telescopes for beginners, while Strike NG telescopes have excellent optical characteristics. The telescope lens is a long-focus achromat with an air gap. Thanks to the small relative aperture, the number of distortions and aberrations that degrade image quality is reduced. The objective lenses are made of high-quality optical glass, they are coated with a multi-layer anti-reflective coating - this helps reduce light loss in the optics and increase the brightness and contrast of the image. The telescope lens is equipped with a lens hood that protects it from dew on cool nights and prevents glare from nearby light sources.

The telescope package includes all the necessary accessories., the device and accessories are supplied in a beautiful gift box - this is very important if you are choosing a telescope as a gift for a child or teenager. The colorful cardboard box will attract everyone's attention, and the rich equipment will allow you to start making observations at the first opportunity.

No other telescope has this configuration:

	1. Book “You have a telescope. What to do next?". This reference book for the amateur astronomer contains information necessary for planning and conducting observations. Written in simple language, it will help you take your first steps in amateur astronomy and not get lost among thousands of stars. The book contains maps of the starry sky, on which the most interesting objects are plotted. Comments from a specialist will help you navigate and correctly point the telescope at desired point celestial sphere. After reading this book, you will learn how to quickly find 280 astronomical objects in the sky, and gain basic knowledge about the planets of the solar system, the Moon, stars, galaxies and nebulae. You will learn to navigate the night sky and easily find familiar stars and constellations.
	2. Stellarium 3D planetarium allows you to see the starry sky on your computer monitor, both in real time and at any time anywhere on the earth’s surface. The program can show you more than 600,000 stars, the Moon and planets, comets and asteroids, galaxies and nebulae. In addition, it can simulate realistic sunrises and sunsets and even such rare phenomena as solar and lunar eclipses. You can see all this without leaving your home – and regardless of the weather outside!
	3. Set of posters “Moon”, “Sun and other stars”, “Solar system”. A series of posters dedicated to space topics, each of which contains a large amount of useful information about a variety of space objects. The history of the exploration of the Earth's satellite, what the lunar maria are, what is known about other stars (which can be thousands of times larger than our Sun!), how the planets of the solar system differ from each other - you will find answers to these and many other questions on these posters. For ease of perception, the information is divided into separate blocks, and colorful pictures will attract the attention of even those who have never been interested in astronomy. The size of each poster is standard format A1 (84x60 cm), they are printed on coated paper with a varnish coating.
	This round star chart lets you know which constellations will be visible in the sky at a given location at a given time. To do this, you only need to know the date and time. The card is easy to use; thanks to its small size and light weight, you can take it with you on any trip, and thanks to the double plastic coating, it is not afraid of water and will not rub even with active use.
	Necessary for astronomical observations in situations where it is impossible to determine the direction to the cardinal points from the stars - for example, in case of strong illumination or limited visibility from the observation platform. It will also be useful for novice astronomy lovers who have not yet learned how to find the polar star. Using a compass, you can easily navigate the cardinal directions and get your bearings by comparing the stars in the sky with the map.

What is in the box:

• Telescope tube
• Altazimuth mount with yoke and declination axis
• Metal tripod with accessory tray
• Eyepieces 6 mm and 20 mm
• Barlow lens 3x
• Red dot finder
• Diagonal mirror
• A beginner's astronomer's guide “You have a telescope. What to do next?" (contains detailed information about 280 space objects)
• Set of posters “Moon”, “Sun and other stars”, “Solar system”
• Planisphere - a moving map of the starry sky
• The Stellarium disk is a virtual 3D planetarium for easy navigation in the expanses of the stars
• Operating instructions and warranty card

Get acquainted with astronomy, study the location of constellations, see the planets of the solar system, supplement your school course with practical exercises - all this at an affordable price from Levenhuk.

Pay attention to articles and materials:

• Review article on how to choose a telescope for a child on the website www.site
• “Review of the Levenhuk Strike 80 NG telescope” on the website www.infuture.ru (download pdf version).
• Review of the Levenhuk Strike 80 NG telescope (.pdf) from the website www.popmech.ru.

Total reviews and comments:5 9 - 9; - 0

An excellent telescope, although I have not yet fully learned its capabilities, with a Barlow lens and a 6 mm eyepiece, Saturn is visible in great detail, Jupiter, the Moon and other planets solar system the visibility is excellent, with the exception of Uranus and Neptune, galaxies and some nebulae are visible, in general, the telescope is excellent! 5

Answer:

I recently bought this telescope. To be honest, I expected more from it. Large craters and seas on the Moon, some galaxies, stars are visible, but in general it is good only for the Moon and Jupiter. For a beginner it is very useful (which I was), but then you will get tired of it and you will want a larger and more powerful telescope. 8 telesops out of 10 5

Answer:
Thank you for your review about the Levenhuk Strike 80 NG telescope!

Hello! I purchased this telescope two years ago, when it first appeared. This is an excellent telescope for a beginner. It’s good both in the city (we have little light pollution) and outside the city. How many times have I been on field trips and I’m as good as new? Nothing came loose, nothing came loose) Thank you for the wonderful telescope) 5

Answer:
Thank you for your review of the Levenhuk Strike 80 NG telescope!

I really liked the telescope, it’s a pity it’s just black and white 5

Answer:
Thank you for your review about the Levenhuk Strike 80 NG model. The image observed by the eye through the eyepiece is usually colored, but not always. The image will be in color when observing terrestrial objects, as well as the Moon and planets; you can see the colors of some stars. At the same time, faintly luminous deep space objects, such as galaxies or nebulae, are visible through a telescope as grayish clouds. However, when observing in large telescopes with an objective diameter of 250-300 mm or more, subtle colors can be seen in the brightest deep-sky objects. In addition to the telescope aperture, much depends on the observing conditions (primarily on the level of illumination), adaptation of the eyes to the dark and individual characteristics observer's view. But even with the largest professional telescope it is impossible to visually (i.e. with the eye) see deep space objects as bright and colorful as we are used to seeing them in photographs.

Compared to some telescopes, this one is a feather. Levenhuc strike 80 ng weighs 6 kg, and some can reach 40 kg in weight 5

Answer:
Yes, indeed, thanks to the azimuth mount, the Levenhuk Strike 80 NG telescope weighs just under 5 kg, which makes its transportation not burdensome and installation easy.

I’m reading your questions and don’t understand... shouldn’t I look for answers on my own on the Internet, or at least in the product description, or even in the same questions, only a few lines below!? Have our people really become so stupid that it’s easier to ask than to develop yourself... sadly. There is a wonderful section on the site: http://www.site/articles/telescopes/ - there are answers to 99% of the questions you ask. 5

Answer:
Thanks for your feedback!

I bought it, but haven’t been able to try it with a Barlow lens yet. This miracle weighs 6.5 kg when fully equipped. The included program is excellent, you don’t even need a telescope with it))). So far I'm happy with everything. 5

Answer:
Thanks for your feedback.

A compact and lightweight refractor that can be easily carried in one hand. The first thing that catches your eye is the colorful, original packaging, which not only attracts attention, but also makes you want to quickly get acquainted with its contents. Whatever you say, the telescope can well be considered the eighth wonder of the World, because only it is capable of delighting us with beautiful pictures of the starry sky and revealing the secrets of distant constellations and galaxies.

If you have a case or cover, you can even transport such a telescope on public transport, since its dimensions when disassembled are comparable to the size of a tripod and do not exceed 80 cm. The presence of a wraparound prism, which allows you to obtain an uninverted image, makes Levenhuk Strike 80 NG into a universal telescope, suitable for terrestrial observations. It’s a pleasure to watch barges, yachts, and fish in it. Therefore, you can take the telescope with you when going on vacation, even in daytime- there will always be a use for it. This telescope is the eldest in the family LevenhukStrike, which includes two more junior models, and has excellent image quality.

The telescope tube is painted in a classic white color, which prevents it from getting too hot in the sun during the day, and does not allow it to get lost in the landscape at night. In the moonlight, the pipe sparkles in the darkness, attracting the observer’s attention and inviting an exciting walk through the starry sky.

Some photos LevenhukStrike 80N.G.

The build quality of the telescope is not satisfactory. The tube is made carefully; immediately after assembly, the telescope gives the impression of a reliable and convenient optical instrument. The red dot finder, or “Starpointer” (also known as the “Red Dot”), is very easy to use and allows you to quickly and easily aim at the desired object. Before you start observing, be sure to align it with the telescope tube in order to correctly point at objects. The focuser is made of hard plastic, has a soft stroke, without play.

The Starpointer (Red Dot) findser produces a bright red dot.

The telescope is mounted on a Yoke alt-azimuth mount, which lightens the weight of the entire set and simplifies control.

The lens hood reliably protects the lens from impacts and dew.

Installation on the tripod takes no more than 30 seconds. The tripod itself is lightweight, while at the same time the main components are made reliably.

In addition to the eyepieces, which will be discussed a little lower, the kit includes a focal length extender - a Barlow lens. In the photo below you see one of the options for mounting a wrapping prism, eyepiece and Barlow lens.

And, of course, one cannot fail to note the large amount of reference material that comes with the telescope. A planetarium program, a book for beginning astronomers “See everything!”, a planisphere, an instruction manual, plus such an indispensable thing in astronomy as a compass (with its help, to observe the rises of the Moon and planets, the telescope is aligned in azimuth) will allow you to quickly master the controls Levenhuk Strike 80 NG. And, having acquired necessary knowledge for further space exploration, switch to a larger aperture.

The tripod unfolds and is fixed with a tray for accessories, which is very convenient when making observations without getting your hands tangled. We install the compass directly on the tripod spider and orient the telescope in azimuth to the moonrise point calculated in the Stellarium program.

As stated above, LevenhukStrike 80NG belongs to the “light” series, which includes two more telescopes designed as portable and simple instruments for observing the starry sky. They all differ slightly in weight and resolution, the latter having to do with the angle at which the celestial body is seen.

Levenhuk Strike 80 NG telescope test

The test diagram is shown in the figure below. A point with a diameter of 10 microns and illuminated by a white LED is used as an artificial star, removed at an appropriate distance.

The point is to examine the resulting image through a strong eyepiece, that is, use magnifications from 1,4 D.At the output we have an image burdened with various aberrations, and so in any optical system. The test uses ocular projection. The image is recorded using a Canon 350D camera, with a focus of 55mm.

Types of extrafocals and focal points are given below.

As can be seen from the test, the dot is quite decent, although slight astigmatism and spherical aberration are present. Aberrations degrade the image, preventing high magnifications. This does not apply to this example. Since the telescope allows you to attach a reflex camera, we were able to conduct an additional test.

As expected, at the edge of the field, the point is distorted by aberrations, but is quite suitable for shooting in focus.

LevenhukStrike 80NG has high image quality and can be recommended not only to beginners, but also to confident users.

Photography of terrestrial objects and the Moon

For photographing astronomical and terrestrial objects LevenhukStrike 80NG You will need to purchase additional accessories.

In this shooting, a “glass” from a double metal Barlow lens was used (the lens must first be turned out) and an adapter T-ring from M42 to Canon EOS. Installation and landing in the photos below.

Don't forget that the telescope has a plastic focuser, so you shouldn't put too much stress on it. Canon cameras of the thousandth series (350d, 400d, 500d, 1000d...) work with the focuser to the limit. It is not recommended to install two-inch eyepieces,

since the offset increases, plus due to their significant weight they can easily deform the focuser tube.

The shooting itself is carried out in “M” mode with a timer release to dampen the vibrations of the pipe. Below is a shot in focus LevenhukStrike 80NG, in the upper corner of which a fragment of the same photograph is inserted, but at a 55mm focus for comparison.

The moon is filmed in exactly the same way. The use of the astro camera for this telescope is limited because an equatorial mount is required.

Brief conclusions

Certainly, telescopeLevenhukStrike 80NG is an initial basic setup for transition to other aperture (larger lens diameter) instruments. But in order to place your hands and not get confused in a more complex telescope model, it will fit just right. Lightweight, stylish, non-bulky, with a magnificent design, the telescope will immediately fit into the interior of your apartment or cottage. You can always take it somewhere with you as a tool for viewing the surrounding area, of course, without forgetting about its main purpose - observing the starry sky, which will give you many hours of wonderful relaxation while discovering more and more new treasures of our Universe.

And finally, a couple of views of the Moon from LevenhukStrike 80N.G.

LevenhukStrike 80NG- A great choice to start your passion for astrophotography.

Useful information for beginners

The purpose of any telescope is to increase the angle at which a celestial body is visible and to collect as many rays of light coming from it as possible. The principle of operation of a telescope is quite simple: the image of a distant object, constructed by the lens, is viewed through the eyepiece. By changing eyepieces, we change the magnification in the system. Because the LevenhukStrike 80NG primarily intended for beginner astronomy enthusiasts, first we will focus on simple formulas that everyone uses to determine the magnification, field of view of a telescope, and calculate the exit pupil. In the future, when purchasing new models, this will allow you to select additional eyepieces.

The formula for determining magnification is as follows:

M =F/f, Where

F- focal length of the lens;

f- focal length of the eyepiece.

TO levenhukstrike 80NG The standard delivery includes two Kellner eyepieces - 6mm, 20mm. Substituting these values ​​into the formula, we get: M1= 720mm/20mm= 36x,M2=720mm/6mm = 120x.

In addition to the eyepieces, the kit includes a 3x Barlow lens,

which triples the focal length of the lens, creating two additional magnifications: M3=108x,M4=360x.

Field of view of the telescope( G) is calculated as follows:

G(arc min) = 60*W/M, Where

W- subjective field of view of the eyepiece (40 degrees for Kellner)

M-the magnification of the telescope created by this eyepiece.

Thus, we obtain the corresponding fields of vision

G1=67 arc minutes for a 20mm eyepiece,

G2= 20 arc minutes for a 6mm eyepiece,

G3= 22 arc minutes for a 20mm eyepiece and 3x Barlow lens,

G4= 7 arc minutes for a 6mm eyepiece and 3x Barlow lens.

Let's consider schematic diagram telescope on which it was created LevenhukStrike 80NG.

At the exit from the eyepiece we have a narrow beam of rays with a diameter d, the so-called exit pupil. Its value needs to be known, since in the literature, for observing a particular type of object, it is often not the magnification of the system that is indicated, but the diameter of the exit pupil

within the specified range. This is due to the fact that the magnification of the system depends on the focal lengths of the lens and eyepiece and is a relative value, while the diameter of the exit pupil is an absolute value. It is known that the pupil of the eye in the dark has a diameter of 6-7mm, and in order to collect all the light from LevenhukStrike 50NG, we need to use the smallest magnification, which for this model is 35x. Let's calculate the diameter of the exit pupil using the formula:

D/d=F/f=36 ,d=80/36=2.2mm.

It can be seen that the diameter of the light beam emerging from the eyepiece falls on the pupil of the eye, while covering a field of just a degree ( G1=67).

Example 1 - Orion Nebula (M42)

In the materials for the telescope you will find an excellent reference book by A.A. Shimbalev for beginners and a moving star map. For example, under number 125 it lists the Orion Nebula (M42). Its dimensions (1 degree) and magnitude are indicated. It is clear that in order to comfortably observe such an object, you need to choose an eyepiece into which the nebula will completely fit. Let's look at our table calculated above. We see one of the suitable calculations: G1=67,M1=36,f=20mm.

Example 2 - globular star cluster in Hercules

Let's consider another example, No. 85 - the globular star cluster in Hercules. Angular diameter - 23 minutes, brightness - 5.8m.

To begin with, to find it, we place the weakest eyepiece with f=20mm. Then, using the table, we change it to a 6 mm eyepiece: G2=20,M2=120,f=6mm.

And finally we come to another important characteristic telescope, this is the angular resolution. Determined from the formula: Q=140/D. Measured in arcseconds.

For LevenhukStrike 60NG this value is 1.8"" . If we want to observe beautiful double stars, then we will first compare the angular distance between them, indicated in the reference book, with our value Q, to understand if it is possible to do this.

Example 3 - double star, alpha Canes Venatici

For example, No. 10 in the directory is a double star, Alpha Canes Venatici, consisting of two components: 2.9m and 5.6m, spaced 20" apart. It is clear that Q<20 about once every seven. Such a star couple will be resolved with a reserve. Remember also to compare the magnitudes of the components in binary pairs with the observable penetrating magnitude for LevenhukStrike 80N.G. It is equal 11.6 m, anything less is visible.

Observing binary pairs requires the use of resolving magnification. It is different for each telescope. In general, a sufficient resolving magnification is considered to be Mrazr=1.4D, which for our telescope is 112x. Increases more 112x details will not be added, but aberrations in classical achromat will increase noticeably. Therefore, the option with excessive magnification M4 not needed.

Even when observing the Moon, it is better to purchase a lunar filter rather than reduce the brightness by increasing magnification. It is also useful to have a solar filter. You can't observe the Sun without it!!!

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