6

I have adjusted the back-/frontfocus setting in my camera for different lenses.

Now I am wondering if I have to readjust the lenses regularly? Does the back-/frontfocus for a lens change much over time?

7

No. Well, I've never seen it happen.

If it does, I would suspect an imminent mechanical failure.

What I did see once is front or back focusing change between focus-distances. In that case the lens focuses well at one distance but is off at another. Since I've only see it once, it may a defect rather than tolerance error.

  • Thanks, then I know that I don't have to recalibrate them all the time. :) – Guffa Aug 10 '11 at 23:46

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