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Forum: Pentax K-1 12-07-2018, 05:00 PM  
Helios 44-2 and K-1ii Mirror Clearance
Posted By stevebrot
Replies: 14
Views: 698
I did some quick Google work and found this one regarding a K-mount SLR (probably a film camera and maybe not Pentax)...

My mirror hits my Helios 44... is there an adapter that can solve this problem? | Helios 44 | Flickr

I have gotten so I check clearance using my film cameras on "B" before mounting to the dSLR.


Steve
Forum: Pentax K-1 12-07-2018, 04:39 PM  
Helios 44-2 and K-1ii Mirror Clearance
Posted By stevebrot
Replies: 14
Views: 698
Cool! Here is a link regarding the light leak concern and fixes:

Preventing M42 adapter light leaks and dust ingress - an easy solution! - PentaxForums.com


Steve
Forum: Pentax K-1 12-07-2018, 04:27 PM  
Helios 44-2 and K-1ii Mirror Clearance
Posted By stevebrot
Replies: 14
Views: 698
More likely is a firm "crack" during exposure.


Steve
Forum: Pentax K-1 12-07-2018, 04:24 PM  
Helios 44-2 and K-1ii Mirror Clearance
Posted By stevebrot
Replies: 14
Views: 698
Famous last words. Flange distance says nothing about rear element or other intrusion into the mirror box and whether there might be interference with the mirror. There are many M42 lenses that interfere with the mirrors on M42 cameras other than those the lens was made to fit. I can't find a ready reference, but I believe that Preset M42 variants of the Zeiss Jena Biotar 58/2.0 (ancestor of the Helios 44-2) has a protective collar at the rear that fouls the mirror on some bodies, so caution may very well be in order.


Steve
Forum: Pentax K-1 12-07-2018, 04:21 PM  
Helios 44-2 and K-1ii Mirror Clearance
Posted By stevebrot
Replies: 14
Views: 698
Different lens.



Would this thread be adequate?

K-1 + Helios 44-2 - PentaxForums.com

I would expect that the usual concerns would be the most pressing, those are:
  • The rear flange on the lens is not wide enough to engage the mount face on the K-1ii. As a result, the Helios 44-2 will rock in the mount and will also likely focus past infinity.

  • The narrow flange also creates potential for light leak both around the edge of the adapter and at the two squared off notches in the adapter face.

Users on this site generally address both with a rubber O-ring or gasket to cover the gaps and stabilize the lens on the front of the camera.


Steve
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