What causes the need for autofocus adjustment?

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Terry K1
Terry K1 Senior Member • Posts: 1,013
What causes the need for autofocus adjustment?

Hello,

I have an FA 43 lens that I've never liked, so today I checked it for autofocus adjustment. It was back focusing really bad. I started with +7 and kept checking it. It ended up taking +10 to get it sharp. What causes my lens to need such a drastic adjustment? Thank you.

 Terry K1's gear list:Terry K1's gear list
Pentax K-1 II Pentax smc DA* 200mm F2.8 ED (IF) SDM Pentax smc DA* 300mm F4.0 ED (IF) SDM Pentax smc FA 31mm F1.8 AL Limited Pentax smc FA 43mm F1.9 Limited +5 more
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