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05-11-2011, 02:41 AM   #1
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M42 lens focussing problems in infinity

Got my hands on a 1:1.8/55 auto-takumar, use a PK adapter ring and started shooting.
while trying out it's capabillities I came over a problem, I can't get it to focus on distances of 10mtr/30ft. and beyond.
Shorter distances give perfect pictures. (at least when I do the right things)
Am open for any suggestion since I'm stuck here.

05-11-2011, 03:11 AM   #2
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What camera are you using this on? Screw Mount? K mount? If K mount, what adapter are you using? Is it flush with the face of the K mount or does it stick out a bit?
05-11-2011, 03:23 AM   #3
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Oh, sorry here some extra info
I use a K20D, so I have to use an adapter ring to fit on it.
The adapter ring has a face thikness of about 0,8mm
05-11-2011, 04:00 AM   #4
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You will need to get an adapter that allows infinity focus.

Hin's Tech Corner: Genuine Pentax M42 to K Adapter

05-11-2011, 04:22 AM   #5
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Thanks, understand now that even the 0,8mm extra gap will infuence the focusing. Had I used my head before i bought the ring I use now, I'd use a few extra bucks for one that will work on infinity.
So here I am buying an other one, sometimes using ones abilities to read are very usefull, should have used it before running nose first in the wall.
thanks guys for your help, much apreciated.
sorry for my lousy english
05-11-2011, 08:27 AM   #6
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Did you change lenses just to make sure it's the adapter?

I use a fotodiox (10 bucks on amazon) on my k110d and haven't looked back.

Good luck, and happy shooting.
05-11-2011, 05:32 PM   #7
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Keep the wide-flange NIF (non-infinity-focus) adapter. It's useful with 1) some old teles and mirrors (that focus past infinity), and 2) shooting close-ups (where infinity doesn't matter) and portraits (where you WANT infinity to be out-of-focus). Yes, to shoot infinity, you need a thin-flange adapter, as suggested. But on your ST 55/1.8, the NIF adapter should drop close-focus from 45cm to 30-35cm, real handy when you want to close in on something.
05-11-2011, 05:36 PM - 1 Like   #8
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Just think of it as the smallest extension tube.

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