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12-20-2015, 10:26 AM   #1
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Image shift while manual focus with 16-85mm in Live View


I was testing out a Pentax HD 16-85mm vs a Pentax 20-40mm LTD for manual focusing in live view. I noticed that as you rotated the focus ring the image on the live view screen slightly shifted over when focusing the 16-85mm, but not when focusing the 20-40mm. I am not talking about the shift from in focus to out of focus, but more a lateral shift of what is viewable in the frame (like more of a tree slightly moving into the frame). I vaguely recall this happpening with another lens (maybe the 18-135mm?). Has anyone experienced this? Is it from the construction of these lenses, or could there be a defect? Is this something more common in zooms with more expansive ranges?



12-20-2015, 10:37 AM   #2
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There was another thread on this a few days ago:

Aka pretty normal in my opinion. The 20-40mm has a premium metal construction so I wouldn't expect it to have any play.

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