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I received back from Canon my 70-200mm f/4 IS lens from being repaired. At 70mm and when I focus on subject, then rotate zoom to 200mm, the subject is very blurry. I have to turn the focus knob to bring it back into focus. Say the subject is ~2.8m showing on the dial at 70mm, at 200mm I need to turn it to about 3.2m to be in focus. The wife’s lens does not do this. Hers has a slight blur and need a very minor bump of the knob.
Could you check yours? This does not seem normal and this might be a problem that Canon will be able to adjust? Thanks…
Below is what service was preformed.
“Your product has been examined and it was found that the ae assembly did not operate properly causing error 01 to be displayed. The ae assembly was replaced. Further, it was found that the adjustment of the af assembly was incorrect causing the auto focus to operate improperly. Electrical adjustments were carried out on the af assembly. Product functions were confirmed.
Part replaced: Power diaphragm unit.”
Lens micro adjustsments, -2 @70mm to +2 @200mm with 1Dmk4. +2 @70mm to -7 @200mm with 5Dmk2. Using Focal