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Here's some more tests from tonight with autofocus and Bahtinov mask.
1. Manually focus with the Bahtinov mask - 10350 steps
2. Run autofocus - 10362 steps - 12 steps or 48 microns difference
3. Re-run autofocus - 10359 steps - within 3 steps of previous result
4. Check current focus position with the Bahtinov mask (10359)
5. Manually focus with the Bahtinov mask - 10349 steps (10 steps in on AF position = 40 microns difference
6. Re-run AF with 20 steps per point - 10370 steps - 20 steps difference
7. Check current focus position with the Bahtinov mask (10370)
8. Manually focus with the Bahtinov mask - 10350 steps (20 steps in on AF position = 80 microns difference
9. Run autofocus - 10363 steps - 13 steps or 52 microns difference
10. Re-run autofocus - 10367 steps - within 4 steps of previous result
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