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Forum: Pentax K-1 & K-1 II
08-10-2020, 10:57 PM
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How much does does your lens cap construction increase the flange distance?
More directly, do you get infinity focus in the following setup?
(m42 body)>(your adapter)>(PK lens)
To me it looks like the remaining portion of the rear lens cap is acting as an extension tube.
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Forum: Pentax SLR Lens Discussion
08-10-2020, 10:45 PM
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Great work! Only useful reply in the thread. Thanks!
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Forum: Pentax SLR Lens Discussion
05-02-2011, 01:02 PM
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 Quote: You have two problems: - The weird focus ring
- Infinity focus on the Nikon
The focus ring can be sanded, ground, or machined down. The distance is not very much (a few millimeters) and can be measured by noting the offset from the actual mounting flange. I would probably go as far as the start of the knurling.
As for infinity focus...Nikon cameras have an infinity focus registration just a little bit more than that for M42 (+1.0mm). As a result, M42 lenses do not adapt to Nikon without an auxiliary optic on the rear of the adapter. Unfortunately, that optic often results in image degradation. Solutions vary according to the lens in question. On some lenses (e.g. Zenitar 16/2.8), infinity "run-out" is easily adjustable according to the position of the focus ring itself. This is may be the case with your Helios 44-3. If the "stop" is part of the focus ring, you should be able to simply reassemble the ring so that the index is a little shy of the infinity mark. It will take some trial and error, but might work. (It helps to confirm the infinity focus using a film body with a split-image finder as a reference.)
Again, any other forum members are encouraged to add their advice!
Steve Ok, so to get a Helios 44-3 with a receded mount on a Nikon or Pentax body with infinity focus, you sand off the portruding part of the focus ring, reassemble the focus ring then mount it to the camera body using an M43→DSLR (no infinity element) adapter?
Please correct me if I am wrong. Thanks!
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