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SSD upgrade that takes full advantage of APFS

Sigma SD1 Merrill: Autofocus Errors

I discuss my field experience with Sigma SD1 Merrill autofocus via multiple examples.

Sigma SD1 Merrill autofocus errors

Update: notes and discussion added on accuracy and precision.

Grass Island
Sigma SD1 Merrill + Sigma 35mm f/1.4 DG HSM
Rigorously lab tested and OWC certified.

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