reviews

I got a rare pair of binoculars on Abbe-Koenig prisms – Eyeskey Zenith 10×42 for testing. The use of such prisms, compared to binoculars on Schmidt-Pechan prisms, should provide higher light transmission due to fewer reflections. The manufacturer claims a flat field without distortion and field curvature (FLAT FIELD). The 10×42 format itself (10x – magnification, 42 mm – lens diameter) is universal – for both daytime and astronomical observations.

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Eyeskey 10x25ED – small compact binoculars with a declared magnification of 10x and a lens diameter of 25 mm. Thanks to the folding and compact design, the Eyeskey 10x25ED binoculars do not take up much space during transportation, and the small weight of the binoculars allows you to wear them on your neck for a long time. The use of ED glass is declared, which should reduce chromatic aberration on the axis compared to binoculars on ordinary glass. Schmidt-Pechan prisms are used to invert the image.

Specs:
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I got the Eyeskey Infinity 8×50 binoculars for testing, which have very rare parameters (8 – magnification, 50 – objective lens diameter in millimeters). The official website claims Flat Field technology, where the manufacturer promises a sharp picture across the entire field:

There are no declared characteristics on the binoculars page. I found the company’s product catalog, there is some information there. In the fall of 2023, I had a chance to look through these binoculars at an exhibition – I liked them, I remembered their small dimensions and wide field of view.

The exit pupil is declared to be 6.3 mm, the field of view is 8.2 degrees, and the eye relief is 17.9 mm. Interesting.
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