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12-22-2008, 03:33 AM   #1
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K20 AF adjustment--how to???

Hey all...Thanks in advance for you insights.

I've just purchased the K20 coming from a K10 and want to know how to work the AF adjustment properly. The manual is not clear which way to push the focus +/- , when dealing with front or back focus.

I have found that my 70 ltd is backfocusing a bit but I dont know whether its adjustment should be + or - and I've played with it a bit but cant get the focus dialed.

Once again, thanks in advance for you help and insight.

12-24-2008, 05:09 AM   #2
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Original Poster

Any help would be appreciated...

12-24-2008, 05:45 AM   #3
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Im pretty sure the lenses I had/have that need adjusting were front focusing, and I had to put in - adjustment.

But since you'll want to fine tune it either way you should probably just try some systematic method of narrowing the AF adjustment until you get the results you want. Obviously do it in good lighting and not indoors under tungsten or else you'll be way over compensating for a front focusing issue you dont really have.

The other week I did a whole bunch of shots in steps of 2, then fine tuned from there till my 50-135 was focusing fine. Perhaps try something ilke that, pixel peep and take it from there.

Last edited by avian; 12-24-2008 at 07:11 AM.
12-24-2008, 07:30 AM   #4
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If you lens is front focusing you need to make a negative (-) adjustment. If it is back focusing, make a positive (+) adjustment. You can change it over and over again until you get it right. Remember focus adjustment only works with auto focus. It makes the focus motor stop before or after the focus target. Some people think that focus adjustment works with manual focus too. But that is not so.

12-24-2008, 08:06 AM   #5
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Thanks for the replies....I have been moving the dial - to adjust but cant seem to get it dialed in. Common sense tells you if its front focusing to move it in the - direction, but the manual doesnt specifically say that....OK thanks again and I will persist until its tack
12-24-2008, 11:58 AM   #6
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QuoteOriginally posted by J.Scott Quote
You are speaking in riddles.

The camera has AF (C or S) and M (manual). Some lenses allow for 'shift-focus' - focus with AF but then tweak it a bit using the focus ring on the lens.

But this + or - AF adjustment you speak of is a mystery to me.

The only + or - adjustment I have is to override the exposure.

I apologize if I misinterpreted your problem.
He's talking about a feature only available on the k20D.

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