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04-30-2016, 02:33 AM   #1
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K-r & Helios 44-2


I bought yesterday a nearly mint 44-2 (MMZ Zebra - N0069306) mounted on a Zenit B, but my copy wouldn't reach infinity. I had to mod it like Nikon users do by adding a little bit more space between the rear element group and the aperture socket with a small ring of plastic in the helicoid (1mm thickness or so) now it reaches the long end just fine (and it's daaaamn sharp even wide open...i'm amazed, lucky having a good copy maybe, but first shot test are much sharper than my SupTak 1.4@2...)
Wonder if someone had to do such modification to get it work or this is just my copy?

04-30-2016, 04:02 AM   #2
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Congrats! My Helios 44-2 is not super sharp wide open, barely acceptably sharp.

What kind of adapter are you using? Are you using the genuine Pentax adapter, or a flanged adapter?

Because "infinity focus" is usually closest to the sensor (and near focus move the elements further from the sensor). So the problem is the other way - if the lens is too far from the mount/sensor, then it won't reach infinity. If it is too close, then it might go past infinity and it might not reach minimum focus distance correctly
04-30-2016, 04:39 AM   #3
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Thanks for your return, got an adapter which allows infinity focus (no flange) but not a Pentax genuine. It works well with every m42's i got except this very 44-2.

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