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This post is meant to finally clarify the MFA (micro focus adjust) procedure for using EMF AF Confirm chip.
I am a digital engineer by training originally. I know it said to enter using scale of 0-31. BUT it was never explained the relationship within the MFA scale for the adapter to actual MFA numbers we are use to (-20 to +20 in Canon). Most people leave their Camera MFA on 0, others seem to emulate the right value or use it as micro-adjustment to the value entered into the Chip.
For EMF chip MFA entry, instructions want you to enter 0-31...Show more →