why micro focus adjustment ?

Started Feb 25, 2013 | Questions thread
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Chimere
Chimere Senior Member • Posts: 1,450
why micro focus adjustment ?
1

Can someone explain it ? Since the AF works via the light path over the mirror, the camera should find the proper focus even if the lens has a slight deviation from its nominal f value. I would think that a correction would be needed if the mirror path distance and the sensor distance do not agree. But then, the camera would need the adjustment and not the lens.

Chimere

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