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I noticed that when I quickly turned my focus ring, the focus jump in focus was rather big: with a slight quick turn, I can almost jump between near focus and infinity. If I slowly turn the focus ring, it seems like I have to turn more to achieve the same focus distance.

For now I think this is by design, and there is a setting to enable/disable this behavior?

I hope my explanation is clear, it looks like the focussing is not linear, but is tied to how quick the ring is moving?

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    \$\begingroup\$ I think your lens has a fly-by-wire focusing system. If yes take a look at manual. \$\endgroup\$
    – user152435
    Dec 20, 2016 at 10:50
  • \$\begingroup\$ You are correct. Is there someway to make the handling linear? \$\endgroup\$
    – TomCB
    Dec 20, 2016 at 11:29
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    \$\begingroup\$ Sorry, I looked everywhere I can. But couldn't find anything related setting it up... \$\endgroup\$
    – user152435
    Dec 20, 2016 at 14:32

1 Answer 1

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it seems like its a sort of function to help auto focus, I've noticed relatively similar results with a couple of my lenses, but obviously (from my icon), I'm a Nikon fanboy, so I have no experience with Sony equipment, but since my guess is its related to auto focus, do you have the auto focus function turned off on the lens itself as well as the camera body. but that's my best guess

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  • \$\begingroup\$ There is no switch on this lens. I do think that must be the case indeed. Not really useful for filming though... \$\endgroup\$
    – TomCB
    Dec 30, 2016 at 20:22
  • \$\begingroup\$ that's very unusual, I've never encountered a lens without a AF switch, sorry I couldn't be very helpful \$\endgroup\$ Dec 30, 2016 at 20:31

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