I have a problem with the circular polorizer when used with my EF 70-300mm III lens. The body is a EOS 30.
Whenever I zoom out of 70mm, the viewfinder looks out of focus (double or slpit images) but the body thinks it is focused (beep beep). I tried to refocus to fra and near objects but the lens just can't focus -- and the camera keeps reading as in-focus.
When I remove the C PL. everything is OK.
I am really afraid if there is someting wrong with the EOS 30. How can it return a in-focus reading when the viewfinder shows 'slpit image' ?
This is a big time crisis for me. Please help.