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Meopta S2 20-70x

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Meopta S2 20-70x Details

Meopta S2 20-70x
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Meopta S2 20-70x Specifications

Spotting Scope SeriesMeopta Eyepieces
Variable magnification

Variable magnification


Optical products with variable magnification are more versatile as they're designed with a wider range of magnification and larger viewing angle. With their high number of lenses in housing, optics with variable magnification are larger, heavier and have lower permeability of light. Variable magnification is rarely present in binoculars, but it's mostly used in riflescopes and spotting scopes. Advantages of the variable magnification regarding usability with riflescopes and spotting scopes outweigh disadvantages – in short one fits all. High quality variable binoculars are very rare.


Minimal magnification20x
Maximal magnification70x
Min. exit pupil diameter1.2 mm
Max. exit pupil diameter

­Max. exit pupil diameter

The concept of pupil is fundamental for the observer, even to determine which is the most suitable equipment or accessory. A well-known parameter for binocular users is precisely the exit pupil, which would be the effective area at the exit of the ocular where the image captured by the observer's pupil is formed.

It is the beam of light that leaves the ocular and enters the pupil of the human eye. The exit pupil must not exceed 7 mm at any time. The reason behind is that human eye cannot expand over 7 mm. With age, the maximum opening of the pupil decreases, so that a person of 60 years will reach a maximum opening of 4 or 5 mm. For this reason, it is necessary to calculate for each observer and according to their age, the minimum expansion factor to be used.
The more an eyepiece is able to magnify the image (and the smaller its focal length), the smaller the size of the exit pupil will be. For example: In a 200/1000 mm telescope and a 35.7 mm eyepiece, an exit pupil of about 7 mm will be reached. With a 10 mm eyepiece, the value will be only 2 mm.

We recommend optical devices with the exit pupil bigger than 5 mm for the low light use. Ideally, such scopes or binoculars should have around 7 mm exit pupil. For daytime use, exit pupil can be between 3-5 mm and even with unique products at least 2 mm exit pupil is advised. Use of the products with an exit pupil smaller than 2 mm is very uncomfortable and tiring.

Maximum exit pupil

Source: Nikon

4.1 mm
Min. eye relief

Minimal eye relief

Minimal eye relief is a minimum distance between the eye and eye-piece lens (rear of the scope, some manufactures call the eye piece ocular). For safety reasons, due to the recoil of rifle, minimum eye relief for rifle scopes has to be at least 80mm. Larger rifle calibers produce higher recoil, so it is adviced to have a minimal eye relief of 90mm or even more. Due to safety reasons new rifle scopes have longer eyerelief than older. Longer eye-reliefs were achieved with an advance of optical tehnology.  

Because of safety reason some rifle scopes for safari rifles have extended eye-relief of more than 120mm. Scout and pistol scopes more than 500mm eye-relief, since they are usually mounted far away from the user.

Safety should be always on 1. place when handling guns and shooters often ignore, so make sure that you don`t get a »black eye« injury and choose the scope with a minimal eye relief of at least 90mm. 

minimal eye relief

Source: Revija Lovec

18 mm
Max. eye relief (mm)18 mm
Light transmission

Light transmission


Light transmission specifies an amount of light that is let through the build of optical product. Every crossing through each lens means a certain loss of light (0.1% with best coatings, up to 5% without coatings). Higher light transmission rate is very important when using optics at dawn or twilight. Good optics normally have light transmission up to 90%, whereas top-notch ones have 95% light let through.

Although the quantity of light reaching the eye depends on the size of an exit pupil, light transmission determines transparency of the lenses, whether the image is dark and cloudy or bright and clear.

Light transmission can be increased with applying different coatings on the glass surfaces. However, it depends on the coating type and number of layers. Multi-layered coatings mean higher light transmission.

Light transmission

Uncoated glass reflects about 4% of the light (top line), single coating reduces the reflectivity to approx. 1.5% (middle line), multi coating reduces the reflectivity to approx. 0.1 to 0.2 % (bottom line)
Source: ZEISS

Lens coating

Lens coating


Optical products have many lenses in their housing. With each lens about 5% of the light passing through is lost. This can be solved with an application of coatings on the glass surfaces. With years the technology of coatings changed. At first they used only one layer, where the reduction of the loss was to 2% per surface. Today they use multiple layers of coatings where there’s minimal loss of light - 0.1% per surface. The best binoculars have even 95% of the light transmitted to the eye, through all their lenses.

With increasing transmission of the light, the coating is also important as a protectant of the optical glass and to ensure the true color fidelity, so the colors when entering are the same when exiting binoculars/riflescope. Above all, coatings also increase the image quality because all the light bouncing around on the inside can cover up detail and blur colors.

Lens Coating

Source: ZEISS

The process of applying coatings has to be precise, otherwise it can contribute to hazy and blurred image. They must be spread evenly and thinly to ensure the best quality. The better the coatings, the more expensive the optical product.

Lens coatings are as important as the quality of the lenses themselves. You can easily check whether your optical product has coatings – if you look at the reflection and it shows multiple colors such as purple, green or yellow the lenses are definitely coated. On the opposite, lenses with no coatings have a clear reflection without showing any colors.

There are many different ways of applying lens coatings:

  • Coated: where one or more glass surfaces are coated with one thin anti-reflective layer.

  • Fully coated: where all glass surfaces are coated in one thin anti-reflective layer.

  • Multicoated: where one or more glass surfaces are coated in multiple layers. Light transmission is more than 75%.

  • Fully multicoated: where all glass surfaces are coated in multiple layers. Light transmission is more than 85%.

  • Outer surface coating: coating on the outer glass surface which protects the lens from external dew (especially in the winter), partially from dirt and other impurities. They can have different names, depending on the manufacturer (LotuTec, Swarodur, AquaDura)

LocuTec coating

Source: ZEISS

Fully Multicoated
Diopter range

Diopter range in optics with one ocular (riflescopes, spotting scopes, NV optics, …)


Diopter range is an adjustment on optical products which can correct the prescription on each of your eyes. That way you can see a sharp image without wearing glasses. The diopter ring is normally located on the eyepiece and by turning it your image appears sharper.

Every optical product has different diopter range, from positive (+) to negative (-).

Diopter range in binoculars


The diopter ring is present in central focusing system on each of the barrels near the eyepiece, where you can correct the difference in the prescription of the left and right eye individually. Once you have set the right value, you can focus the image with using just the central focusing ring. If you’re wearing glasses, the diopter value should be set to 0, because the differences in your eyes are already corrected in your glasses.

To see a sharp image without wearing glasses you can easily set the diopter by looking with bare eye, turning the ring and adjusting sharpness. So when looking with both eyes your image should appear sharp. If you have astigmatism the diopter adjustment cannot correct it – you’ll still need your glasses and diopter set to 0 to see sharp images.

Diopter Range


- 3.0 / + 3.0 dpt
Photo adapterYes



Waterproof feature is made to keep the optical products sealed and protected from water or dust. Such products are suitable for marine, hunting, hiking or in extreme humidity. Even if you’re not planning on using them in this kind of situations, it is a good feature to have in case of heavy rain or dust. Waterproof optical products are typically sealed with O-rings.

All optical products that are fogproof are also waterproof, because they have to be properly sealed to keep the dry gas inside. Yet not all waterproof products are fogproof as the air inside the barrels is not necessarily replaced with dry nitrogen or argon.

You should be careful not to confuse waterproof with weather-resistant as they’re designed to protect only against light rain and are not fully sealed.

Slightly better waterproofing of binoculars can also be ensured with an individual eye focusing mechanism, due to less moving parts than with the central focusing system.




Fogging in optical products can occur when you move them from the warm insides of your house to the cold outdoors. To prevent the formation of inside fogging they’re often filled with dry gas – either nitrogen or argon which contain no moisture.

To keep the gas intact on the inside, the optics have to be properly sealed, which is why all fogproof optical products are also waterproof.

It’s important to keep in mind that fogproof means that it’s to prevent fogging on the inside of the optics, not on the outside. If your outside surface of the lenses fogs up due to temperature differences or humidity just allow them to adjust back – do not wipe the condensation off as it can be damaging to the glass surface and its coatings.

Temperature range- 20 / + 10°C
Filled with

Filled with


Optical products are often filled with dry gas to prevent the condensation on the inside of the housing when exposing them to temperature extremes. If there is even a slight sign of air inside, there is a certain % of moisture present. Usually they’re filled with either argon or nitrogen gas, which have the same effect – to prevent the moisture and internal fogging without affecting the optical properties. In addition, these gases also prevent the formation of fungus which would destroy the optics. Internal dewing was the biggest problem in older binoculars when exposed to lower temperatures, because they weren’t watertight and contained air. Newer binoculars are therefore all airtight and filled with dry nitrogen or argon.

Eyepiece diameter

Eyepiece diameter

Eyepiece (or ocular) diameter is outside (housing) diameter of rear side on rifle scope.

Maybe someone is thinking “ouh, so the bigger the eyepiece diameter the bigger image you get and you don’t need to look exactly in the middle to get a perfect picture…” Well, this is not correct. Eyepiece diameter can have different sizes - quality of the inner eyepiece parts and quality of rifle scope in general tells you how big the image will be and how far you can look from the middle point of eyepiece lens and you still get a perfect or good image.

eyepiece diameter 1

Source: Revija Lovec

In production since
Warranty10 years
Made inCzech Republic
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