Fujifilm GFX Does not Always Focus at Full Aperture
Related: focus, focusing, Fujifilm, Fujifilm medium format, medium format
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Regarding my post two days ago, Fujifilm GFX 50s Firmware Update Might Degrade Focusing by Stopping Down?.
Chris D writes:
Just tested this claim with the old firmware, and then the new firmware after updating the camera. The new firmware does not alter the AF behavior with regard to the aperture - it’s exactly the same The lens does not focus at the selected aperture in AF.
DIGLLOYD: good news!
Update: this is actually FALSE. I have personally observed (with the new firmware and probably the old), that the Fujifilm GFX will *at times* focus at other than full aperture.
In the field is that when the lens is set to, say, f/8 or f/11, initiating autofocus sometimes *not* fully open the aperture, but appears to open it to about f/4.5. This with the 45mm f/2.8. That suggests Fujifilm might have (in firmware) an intentional workaround for focus shift behavior for point-and-shoot photographers shooting at f/4.5 and beyond. It is also another way to deal with the shift: focus at f/4.5, which eliminates much of the shift. See Fujifilm GFX Focus Shift Evaluation.
