Why do I have to dial in AF micro adjustment now when previously I didn't need to?

Started Apr 26, 2013 | Discussions thread
Richard
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Re: Why do I have to dial in AF micro adjustment now when previously I didn't need to?
In reply to Learnphotography, Apr 26, 2013

There will be a slight drift in focus over time with any lens but I'm sure that time is greater than 5 months.

Has the ambient temperature change (given it's five months since you first checked AF)?

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