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04-29-2012, 06:30 AM   #1
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how to permanently adjust AF on a lens ?

Hi !

I'm the proud owner of a DA*55, but i'm a bit ... well, let's say it annoyed by a thing : front focus.

I got a real bargain on it because of the FF.

on the K-x i need to use a +180Ám adjust (it's heavy ...) to get perfectly pin sharp pictures.

I was wondering if anyone know a way to permantly adjust the DA* so i would not need to adjust AF on the body each time i change lens ?

Either way i will send it to repair in June.

Thanks folks !

04-29-2012, 07:58 AM   #2
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Yes there is, send it to pentax.
04-29-2012, 08:48 AM   #3
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QuoteOriginally posted by Anvh Quote
Yes there is, send it to pentax.
i hoped something like a "DIY" would exist. I will send it to Pentax then

Thx for the answer !
04-29-2012, 09:08 AM   #4
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Buy a K5, that would be a do it your self solution but don't think that's an answer you're looking for.

You might do well also sending in your other lenses, they will calibrate everything then for you.
Not sure about the price...

04-29-2012, 09:37 AM   #5
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my other lenses are fine, i use a +10 Ám adjust.

And the K5 is something i'm really thinking of, specially since i use my DSLR more and more outside, for climbing session. my k-x doesn't like it very much BTW ...

Adjsut might cost me around 200€ i'm afraid
04-29-2012, 11:29 AM   #6
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200€, yikes...
04-29-2012, 11:37 AM   #7
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On the K-r/K-5/K-7 the camera will remember the adjustments you make.

See this guide:
Fixing Front and Back Focus - Introduction - PentaxForums.com

Might be easier to hang on to the lens and just upgrade your body when the time is right. FF on primes isn't as big of a deal as it would be on a zoom.

Adam
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04-29-2012, 02:08 PM   #8
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Can the K-5 handle a +180Ám in adjustments ?

04-29-2012, 02:51 PM   #9
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I sent my DA* 55mm with my K-5 to Pentax Japan... free. They adjusted the camera, not the lens.
04-29-2012, 03:14 PM   #10
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The K-5/K-r can't handle +180Ám, but, in my case, i did something :
went in debug mode and set it to -60Ám, and then if i'm in bright light i leave the menu adjust at +6, so it equals 0, and if i'm in tungsten i set it to -10, so it equals -160Ám...simple
04-29-2012, 04:32 PM   #11
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I think I must be really lucky...

All my AF lenses appear to focus correctly with no adjustment (which is doublely lucky as I have no idea how to make +/- adjustments on the K-x)... I thought my Tamron 17-50 was front focusing when I first got it but with practice the issue seemed to resolve itself...

How often do most folk actually need to make adjustments in camera for front/back focusing?
04-29-2012, 04:48 PM   #12
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I only need adjustment on my SMC M 50mm 1.7. I can trust on the focus confirmation now even under tungsten light! It's usable even at 1.7! Perfect focus everytime...maybe i don't even need a split screen
04-29-2012, 06:01 PM   #13
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Just one question regarding focus adjustment. Has anyone experienced a difference in focus accuracy depending on aperture. For example if a fast lens is adjusted to be spot on wide open and then when stopped down could it be off focus?
04-29-2012, 06:56 PM   #14
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Nop, aperture doesn't affect that..
04-29-2012, 11:53 PM   #15
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QuoteOriginally posted by everydaylife Quote
Just one question regarding focus adjustment. Has anyone experienced a difference in focus accuracy depending on aperture. For example if a fast lens is adjusted to be spot on wide open and then when stopped down could it be off focus?
Yes, it is called focus shift and it happens often with fast lenses, as a consequence of spherical aberration: What is Focus Shift?

Cheers!

Abbazz
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