Parfocal-ness of the Sony 28-135 G Lens

The lens is of course not parfocal, not optically / mechanically. The camera (or lens itself) constantly corrects the lens groups arrangement to make it "parfocal". In other words, without electronics the lens is not parfocal. This is also the reason why this lens can get by with no back focus adjustement mechanism. Something is off in the way the camera corrects it. 

I noticed some focus issues with my 28-135 zoom lens as well on my FS7. I did some tests with the Canon 70-200mm L-series lens (which is definitely parfocal) and it performed just fine, so I know it isn't the camera. I sent in the 28-135 to have it repaired and Sony replaced the lens entirely. Took the brand new lens right out of the box today and it had the same issues of losing focus as you zoom out. The best way to see the shift is if you turn peaking on and line up a few objects on the z-axis. The focus should move to the closer objects as you zoom out (as long as they are not within minimum focus distance). Here's the wacky thing though - I double-checked to make sure I wasn't in auto-focus mode by switching to auto and playing around with focus there. When I switched back to manual, the lens fuctioned just fine (no shift in the focal plane when zooming). There seems to be some kind of calibration that takes place when you switch to AF, grab some focus with the push auto feature, and switch back. Or maybe I'm wrong. But as of right now, the lack of parfocal-ness no longer exists.

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