DZOFILM 10-24 T2.9, User Manual

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To correct the flange back distance, please follow the steps below.
1、Ready your subject. You can use a “Siemens Star”, a pattern
of black-and-white radiating spokes available on the internet.
Download and print it.
2、Attach the lens to the camera
3、Select the maximum aperture
4、Zoom all the way out.
5、Rotate the focus ring to focus on the Siemens star. Find the
position at which the black-and-white spokes are sharpest.
6、Zoom all the way in.
7、Rotate flange back adjusting ring to reserve compensatory
adjustment on focus until the intersection point is at the sharpest.
8、Repeat steps 3-7 two or three times. The adjustment is
complete when the optimal focus position is the same at all focal
lengths; if it’s not, further adjustment is required.
9、Tighten the F.f lock knob securely when the adjustment is
complete. Theoretically flange back distance requires to adjust after
changing to a different camera.