Originally Posted by AlbertoJ
Hello, IŽd like to know CA (Colour Aberration) comparison Leica Ultravid HD :
-Zeiss Victory FL.
-Kowa Genesis XD.
I haven't seen the Leica HD yet, but my impression is that Leica just dropped in different glass without changing anything else, coating for instance. While I think that this is in itself a good it may not come as a surprise the improvements are minor.
In the Zeiss the use of FL glass was part of a more rigorous design change and so the improvements over previous and competitive models are quite notable.
The same goes for the Kowa XD, where FL glass and improved coating is applied to air-spaced objective lenses. If I'm correct, Kowa in their XD uses more FL glass than any other binocular on the market today. As with the Zeiss the results are excellent. Judged on CA and resolution alone my impression is that the Kowa probably even has the edge here. I for one wouldn't think of swapping my XD 8.5 for a Zeiss, not for a minute.