Interesting... I've never pondered that question before... but:
You should NOT have to refocus the diopter once it's been adjusted correctly for you the first time, with any lens. This "adjustment" is for your eyes, not your lens...
Interesting... I've never pondered that question before... but:
You should NOT have to refocus the diopter once it's been adjusted correctly for you the first time, with any lens. This "adjustment" is for your eyes, not your lens...