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Nifty fifty STM - focus issues, or human error?

Started Nov 16, 2017 | Discussions thread
OP TMHKR Forum Member • Posts: 83
Re: Nifty fifty STM - focus issues, or human error?

archiekar wrote:

-you dont have to go out to 5.6, should be consistent just above F2

-for test being a little close can help with bias, note that focus should be 1/3 in front and 2/3 behind.

-FYI focos and recompose at 1.8, 1.2, 1.4 is going to give you poor consistency it is really hard to nail shots when moving and trying to keep the focal plane fixed especially with a depth of field of centimeters (depending of course on how close you are to your subject). Getting that eye pin sharp EVERY time is just not going to happen under 1.8.

-looks like the issue however is sorted, glad if what I suggested helped.

Well, I'm not sure it's consistent before at least F3.5. Focus jumps are still noticeable, but not as noticeable as with F1.8 and F2.0. The more I stop down the lens, the jumps are less noticeable (there are virtually no jumps by F4.0).

If I keep half-pressing the shutter button several times (while holding focus point on target), the lens jumps a tiny bit at each half-press. It attempts to refocus, but instead it just jumps a millimeter here, a millimeter there (half-press = focused, half-press = unfocused, and so on). I believe that's just how it works.

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