Telescope-Service Binoculars

Telescope-Service - Your Expert for Telescopes, Mounts, Binoculars, Spotting Scopes and Accessories. We offer a broad selection of eyepieces, filters, accessories for astro-imaging and many more interesting items.

Experience Nature With Both Eyes - With Telescope-Service Binoculars

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Telescope-Service binoculars combine a modern design, an outstanding mechanical and optical quality and - most importantly - extremely crisp and contrasty images.

As General Distributor we get these binoculars directly from the factory - we can therefore offer our binoculars at very low prices.

One of the most important factors of a pair of binoculars is described by the so-called twilight factor. It is supposed to inform about how bright an image is. You can easily calculate the twilight factor for any pair of binoculars yourself:

Twilight Factor = Square root of ( Lens Diameter x Magnification )
Example: 10x50 binoculars => Twilight factor = SQRT ( 50 x 10 ) = 22.4

In our opinion the twilight factor is a misleading figure, though: It doesn't really tell much about what you can expect. A very powerful 7x50 has the same twilight factor as an overly dim 12x30.

We prefer a different, much more simple figure: The diameter of the exit pupil.

The exit pupil is the cross-section of the light that leaves the binoculars at the rear. When you hold your binoculars in front of a bright background and look at the eyepieces from a distance you will see a bright circle - the exit pupil. You can see it on the image to the right.

How To Calculate The Diameter of the Exit Pupil:

Exit Pupil Diameter = Lens Diameter / Magnification
Example: 10x50 binoculars => Exit Pupil Diameter = 50 / 10 = 5mm

How to Interpret the Exit Pupil Diameter:

The human pupil opens up to a diameter of up to 7mm at night - on average. This limits the maximum useful exit pupil diameter to that same 7mm - a pair of 10x80 binoculars, for instance, would have an exit pupil diameter of 8mm. Some of its light would be wasted on the iris of your eyes.

Which Exit Pupil Diameter To Choose:

6-7mm ... very bright images. Typical binoculars of this category are 7x50 binoculars. This is very useful for nighttime observing and in the twilight.

4-5mm ... good compromise. Bright image and at the same time usable during the daytime.

up to 4mm ... primarily suited for daytime use.

Exception: ... Large binoculars beyond 80mm lens diameter tend to have an exit pupil around 4mm. Due to their large aperture and consequently large light-gathering power they are still very well suited for nighttime use.

Easy Payment: We offer our customers several easy and fast payment methods. You will receive exact payment details when ordering or on request!

New Telescope-Service Online Shop:

Compact Binoculars
25mm to 42mm objective diameter

Medium-Sized Binoculars
50mm to 70mm objective diameter
waterproof, fogproof, marine, ...

Giant Binoculars
80mm to 100mm objective diameter

Test reviews of some of our binoculars (Italian language): www.binomania.it


10x50 LE - Universal Binoculars excellent contrast - full broadband multicoating very comfortable eye relief .....	10x50 WP - Nitrogen Filled and Waterproof a very robust high-quality binocular for outdoor use excellent image quality - comfortable eye relief ......	7x50 Marine - Excellent Quality Binoculars An extremely powerful pair of binoculars for demanding users. Top image quality. ....

10x50 MX Marine - Excellent Quality Binoculars An extremely powerful pair of binoculars for demanding users. Very good image quality. ....	10x60 - Powerful Astronomical Binoculars This is the largest binocular that can be used free-handed. Bright images at a particularly low price ....

15x70 - Best-Price Astronomical Binoculars Powerful big binoculars for demanding observations of the wildlife and the night-sky - long eye-relief - Best Price ......	10.5x70 Marine - Excellent Quality Binoculars Very powerful binoculars for nighttime wildlife observing and demanding astronomical use ....	15x70 Marine - Excellent Quality Binoculars Very powerful binoculars for nighttime wildlife observing and demanding astronomical use ....


TS Solar Scanner - Monocular and Binocular for perfectly safe Solar Observation Monocular - multi-coating - with Soft Case ....... Binocular - similar to the monocular, but for both eyes	10x25 Pocket Binoculars - also available as Monocular very good performance - Multi-coating - with Soft Case .......... the 10x25 for one eye - it doesn't get more compact than this..	8x42 & 10x42 - Roof Prism - Top Price Fully multi-coated, nitrogen filled, waterproof compact design ....

SALE - 8x42 - Roof Prism - Triplet Objectives Excellent contrast and sharpness over the entire field of view - excellent mechanical quality ..........	TS Nevada 10x42 - Roof Prism - High End Nature and Hunting Binoculars Excellent contrast and sharpness over the entire field of view these binoculars are among the best we know in this price range ..........

Top-Notch Binoculars made by Leica. Leica's binoculars are famous for their truly excellent image quality. You would not believe how much can be seen even in small binoculars - until you have looked through one of Leica's Ultravids or Trinovids!

Leica Ultravid light-weight, state of the art binoculars	Leica Trinovid top quality binoculars, very popular models


20x80 - Triplet Objective - Excellent Image Quality Triplet Objective: better field correction - reduced false colour robust design - integrated tripod adaptor .......	25x100 - Light Gathering Giant Our new and improved 25x100 is now available. Better optics, mechanics and larger prisms make for a supreme binocular particularly well suited for astronomical use ...