When I checked my EF 100-400L II pictures shot yesterday, I had the ugly surprise that they were not as sharp as usual.
I first didn't understand why.
So, I re-calibrated the AFMA, but there was no change, T & W remained unchanged. Since most pictures were shot stabilized, also at short shutter times, I kept wondering.
Until I remembered that the only real change was having added a filter to the lens (B+W Clear filter MRC nano T-Pro).
After removal, sharpness was restored!
Has somebody else experienced the same with a similar highest quality filter?
I first didn't understand why.
So, I re-calibrated the AFMA, but there was no change, T & W remained unchanged. Since most pictures were shot stabilized, also at short shutter times, I kept wondering.
Until I remembered that the only real change was having added a filter to the lens (B+W Clear filter MRC nano T-Pro).
After removal, sharpness was restored!
Has somebody else experienced the same with a similar highest quality filter?