In certain bright conditions some binoculars present a noticeable effect of a sharply defined bright circle on the inner part of the image (roughly inner 2/3 of the total image). I am trying to figure out what this condition is called.
I am also interested in discussion on what causes it, certain brands or models that are worse than others, ways to check for it when trying out retail binos, etc.
Thanks.
I am also interested in discussion on what causes it, certain brands or models that are worse than others, ways to check for it when trying out retail binos, etc.
Thanks.