Originally Posted by Sagittarius
You're probably rapidly shifting your eyes from the center to the edge and back again without realizing it.
however, Dennis is not entirely wrong with his advice that the ELs sell extremely well, that is of course not only due to the sharp edges but also!
I myself also prefer the Flatfield glasses, my impression, the overall sharpness of the image makes it appear more harmonious and balanced.
I had the Zeiss 7x42 Victory for a while, due to the lack of edge sharpness and extreme astigmatism it spoiled my vision, I sold it.
When I look through binoculars with normal edge blurring for a while and then switch to Swarovski 8.5x42, I always think what an incredible optical performance!
It is not so easy to say that sharp edges are unnecessary because you only look through the middle anyway, flat fields are becoming more and more popular, why only?