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Sealing (ISO standard)
Here, we distinguish between "spraywater-proof" and "water-proof". "Spraywater-proof" means that the unit concerned can be exposed to rain without any moisture creeping into the interior. "Water-proof" indicates increased sealing which prevents an interchange between the atmospheres inside and outside the unit. Here, it is important that the leakage test is performed in compliance with the ISO 9022-8 standard for environmental testing. Carl Zeiss applies this standard not only to the leakage test, but also to other environmental tests, such as cold/heat, etc.
It is important to note that Carl Zeiss also complies with the DIN 58 386 standard which allows a maximum deviation of 5% from specifications (e.g. in brochures) for the "magnification", "objective lens diameter" and "field of view " parameters.
Spotting scope
Spotting scopes are high-magnification telescopes for earth observation. Many models have an extendable housing – retractable telescopes – the majority, however, have a rigid housing. For this, there are generally models with straight and inclined viewing available.
In part – as with the Diascope 65 T* FL and 85 T* FL spotting scopes – you have the option of a set magnifying and vario eyepiece.
By the way: stability of the stand and the mobility of the associated video head are just as important as image quality with spotting scopes.
Straylight
Straylight is caused by reflections from the housing, lens edges and mounts and other components. As straylight is superimposed on the image, it results in markedly reduced image brilliance. In Zeiss binoculars and riflescopes, straylight is kept to a minimum by a large number of measures/precautions. These precautions not only include the careful selection of the glass types used and a special treatment of the inner surfaces of the housing or the painting of the lens edges, but also the use of special procedures for the lens and prism mounts and the reversal systems in binoculars/riflescopes to reduce straylight to below 2%, if possible.
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