I'm looking for insight on the Canon 70-200 F2.8 IS II.
Canon says that this lens is not parfocal and more often than not this is true where the image looses focus while zooming.
- at 70mm you focus on your subject
- you then zoom to 200mm
- your subject is now out of focus
From time to time however I have come across version that magically hold focus when you crash zoom in. Has anyone discovered why this happens, or if there is a way to identify versions that work better than others?
Any insight would be much appreciated, even if it's just letting me know that yours holds focus while zooming.
Thanks in advance!