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05-16-2013, 01:10 PM   #1
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AF fine adjustment

If you go into the AF fine adjustment and adjust for the lens that is currently on the camera (50 - 135) to fix a back focusing issue. Then you get a different copy of the same lens (rented one) do you have to reset the adjustments to default settings? Is that adjustment for any 50 - 135 lens? Or just for the on the camera at the time of the adjustment?

05-16-2013, 01:28 PM   #2
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Each lens and body combo needs different settings due to variations in both.

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05-16-2013, 01:47 PM   #3
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QuoteOriginally posted by BethC Quote
Is that adjustment for any 50 - 135 lens? Or just for the on the camera at the time of the adjustment?
Beth, not 100% sure but I believe the AF adjustment is based on the lens ID code. Which would be the same for all individuals of that lens. So that AF adjustment would be for all 50-135's not just the one you set it for.
05-16-2013, 02:49 PM   #4
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What you're adjusting for are the combined manufacturing tolerances of the body and the lens.

Change the lens and you'll be changing the net tolerance, i.e. each lens/body combo is unique, so change one, even for another otherwise identical model and you've created a new unique combination. AF Adjust allows you to fine tune that combination negating (hopefully) the manufacturing tolerances of both bits of equipment.

Note, though, that sometimes this won't be possible, and often leads to lenses being described as 'bad copies'. Often, however, that same 'bad copy' lens will work fine with another body simply because the sum of the tolerances is within the range of the AF Adjust.

The bodies and lenses are built to an engineering specification as well as price. The closer you build to perfection the costlier it becomes, so all manufacturers have design tolerances within a range which are acceptable for the price they charge for the item and the customer is prepared to pay.

PS. Not all 'bad copy' lenses are down to tolerance issues; sometimes they're damaged, really badly put together, etc, and are truly 'bad'.

Last edited by JohnX; 05-16-2013 at 03:00 PM.
05-16-2013, 03:02 PM   #5
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Good question Beth. Easy enough to tell - when you get your rented lens, with it mounted just go into the AF adjustment screen and see if it shows your previous adjustment or shows "0" or that the lens has not been adjusted yet.

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