ef 24-105mm f4 L - focus is changing as the zoom changes?!

Started May 15, 2012 | Discussions thread
berze
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Re: ef 24-105mm f4 L - focus is changing as the zoom changes?!
In reply to maarensv, May 15, 2012

I'd add that no zoom lens is said to be parafocal (just to make it clear). Some exhibit parafocal behaviour (such as the tokina 50-135 which I also happen to have).

I seem to recall a lens could eventually be made parafocal, but there would be no way to guarantee it would stay that way, as minor variations in temperature and component wear would alter the optical balance.

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