I'm happy with the purchase but frankly I do not know which brand would I decide to get if test fileds were ofered at zeiss dealership. And since the Ultravid mentioned has equal or better eye relief than the Zeiss mentioned (though not so great as the Swarovski), I'm wondering if perhaps the eyecups were not fully, or equally, turned all the way up (or down if you wear glasses). For example, a 10x binocular will make an object appear 10-times closer than it would normally appear. I flip and flop in my sensitivity to color fringing, but hate eye relief problems, and would take that comment seriously. Multiple layers of coatings are even more effective; the term "multi-coated" means one or more air-to-glass lens surface has multiple coatings.

If only Zeiss would see fit to add an astigmatism correcting and field flattening group to the eyepiece I would have no complaint. BAK-4 binoculars are more chromatic aberrant than ED glass, which is why they're a bit more expensive. A dangerous combination - but here is a great place to bump up one's knowledge (though at the risk of worsening your binocular addition) . Among them, Opticron Discovery WP PC Mg 8x50 Binocularseems to be the first product you can rely on.e. I think they have exactly the same glass elements, same optical formulae), so you might productively read reviews of any of them. Although a bit dimmer (about 6%) than Ultravid due to its silver rather than dielectric prism coatings, in low light the large exit pupil will supercede the few percent transmission difference.

Also, something that is increasingly important to me, in bright daylight the reduced pupil of the eye will effectively stop the 8x50 down from its native focal ratio of about f/4 to about f/12, which reduces all aberrations by more than the same effect does in smaller exit-pupil binoculars. Turning in the screw causes the UX to expand in the solid building material and to knot within the cavity. Your field of vision is how wide you are able to see the surrounding scenery through your binoculars. It's likely that no further discussion is required, in which case we recommend starting a new thread. For the less adventurous among us, we have to deal with a stiff focuser the rest of the year when we're birding in fair weather, and I can't see the point of that.

The pupil diameter of 8x42 binoculars corresponds to the distance between the pupils in the brightest light and the darkest. A larger objective diameter allows more light to enter the binoculars, resulting in brighter images, especially in low-light conditions. I'm now on the hunt for a fixed power scope and had a play with a Swaro Habicht 8x50 fixed power scope (Reticule 4A) yesterday and was very impressed. I could not find the actual meaning of the term but it may be attributed to the two doublets in the instrument : a cemented doublet in the eyepiece and a cemented doublet for the objective.