Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-07-2018, 03:03 PM   #1
Forum Member




Join Date: Jan 2013
Posts: 87
Helios 44-2 and K-1ii Mirror Clearance

Hello all -


I tried to verify the Helios 44-2 M42 mount using a OEM Pentax M42 to K mount adapter on my K-1ii that the mirror will not hit the back of the lens when focused to infinity. I could not find an answer to this specific question after searching.


Can anyone confirm the 44-2 and K-1ii are OK to use together?

Thanks
Tom

12-07-2018, 03:46 PM   #2
Forum Member
AsahiGlass's Avatar

Join Date: Oct 2018
Location: Florida WPB
Posts: 52
I don't own a K1, but I do have a helios. I don't think you will have an issue.

This guy uses one on a K1 K1 with Helios 44-M Test | Bought a M42 to K mount adapter t? | Flickr
12-07-2018, 04:03 PM   #3
Forum Member




Join Date: Sep 2017
Location: Atlanta
Photos: Albums
Posts: 91
M42 and Pentax K have the same flange distance and mirror strike should never be a problem. PK was designed for backwards compatibility with all of the existing screwmount glass, after all.

Mirror strikes are only really a thing with M42 when adapted to Canon, which has a shorter flange distance than M42/PK, and even then only with wide angle lenses which extend further back into the mirror box.
12-07-2018, 04:10 PM   #4
Loyal Site Supporter
Loyal Site Supporter




Join Date: May 2016
Location: East Coast
Posts: 1,600
I'll give you another "similar" report. I have no issues with my Carl Zeiss Jena Biotar 2/58 on my K-1. Since the Helios is based off the same optical formula, I'd think the basic positioning of the rear element would be the same to have it focus to infinity.

12-07-2018, 04:20 PM   #5
Forum Member




Join Date: Jan 2013
Posts: 87
Original Poster
Thanks all. Iíll let you know if I hear scraping sounds

Tom
12-07-2018, 04:21 PM - 1 Like   #6
Otis Memorial Pentaxian
Loyal Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 31,402
QuoteOriginally posted by AsahiGlass Quote
This guy uses one on a K1 K1 with Helios 44-M Test | Bought a M42 to K mount adapter t? | Flickr
_
Different lens.

QuoteOriginally posted by thix2112 Quote
Can anyone confirm the 44-2 and K-1ii are OK to use together?
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
12-07-2018, 04:24 PM - 2 Likes   #7
Otis Memorial Pentaxian
Loyal Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 31,402
QuoteOriginally posted by zjacreman Quote
M42 and Pentax K have the same flange distance and mirror strike should never be a problem.
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

Last edited by stevebrot; 12-07-2018 at 04:37 PM.
12-07-2018, 04:27 PM   #8
Otis Memorial Pentaxian
Loyal Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 31,402
QuoteOriginally posted by thix2112 Quote
Thanks all. Iíll let you know if I hear scraping sounds

Tom
More likely is a firm "crack" during exposure.


Steve

12-07-2018, 04:36 PM - 1 Like   #9
Forum Member




Join Date: Jan 2013
Posts: 87
Original Poster
Steve - that's what I was afraid of.

I did take some measurements and determined that the mirror should be OK. So I incrementally went to infinity and all worked ok.


Tom
12-07-2018, 04:39 PM   #10
Otis Memorial Pentaxian
Loyal Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 31,402
QuoteOriginally posted by thix2112 Quote
Steve - that's what I was afraid of.

I did take some measurements and determined that the mirror should be OK. So I incrementally went to infinity and all worked ok.


Tom
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
12-07-2018, 04:51 PM   #11
Forum Member




Join Date: Jan 2013
Posts: 87
Original Poster
Thanks Steve. Yes there is a bit of looseness with the Pentax adapter. Will get a washer/ring next time I'm at Lowes or Home Depot

T
12-07-2018, 05:00 PM   #12
Otis Memorial Pentaxian
Loyal Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 31,402
QuoteOriginally posted by zjacreman Quote
M42 and Pentax K have the same flange distance and mirror strike should never be a problem.
QuoteOriginally posted by stevebrot Quote
Famous last words.
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
12-08-2018, 12:39 AM   #13
Senior Member




Join Date: Feb 2014
Location: Tuusula, Southern Finland
Photos: Albums
Posts: 124
I am using Helios 44-2 m42 with Pentax K1 mark ll (and previously K1, K3, K5...)

There's no problem with mirror.

But the light leak is a problem with the original adapter. I strongly suggest modifying the adapter to prevent the leakage.
12-08-2018, 06:52 AM   #14
Forum Member




Join Date: Jan 2013
Posts: 87
Original Poster
Got some o-rings on order.
Thanks all.
T
12-08-2018, 06:30 PM   #15
Forum Member
AsahiGlass's Avatar

Join Date: Oct 2018
Location: Florida WPB
Posts: 52
I use heavy masking tape for the light leakage... I have a 44-2 and it only sticks out 1/8" at infinity focus and the M sticks out the same amount... google 44-2 vs 44m.

Plus it's rare to focus that lens to infinity, so use a flange style adapter. Problem solved.

I love mine.

To check light leakage, turn camera on, put it on live mode, leave lens cap on and u can see an image. Its actually pretty cool.

---------- Post added 12-08-18 at 06:30 PM ----------

my avatar pic is with a 44-2!
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
dslr, focus, full frame, full-frame, helios, helios 44-2 58mm, infinity, k-1, k-1ii, k1, lens, light, m42, mirror, pentax k-1, sticks
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Helios 44 silver 13 blades vs. Helios 44M-7 Cabessius Pentax SLR Lens Discussion 3 07-31-2018 08:05 PM
Which Helios-44 produces the best "swirl"... 44-2, 44M & 44M-4 tested BigMackCam Pentax Lens Articles 11 02-05-2017 11:34 AM
Helios 44-2 (Гелиос-44-2) 58mm f2 preset 8 blades ducdao Pentax SLR Lens Discussion 5 04-25-2010 06:15 PM
What does the 44 stands for if anything, on the Helios 44-2? ismaelg Pentax SLR Lens Discussion 2 03-01-2010 02:05 AM
For Sale - Sold: M42 Helios 44M-6 MC 58mm F/2 & Helios 44-2 58mm F/2 donTTouchonlywatch Sold Items 6 12-25-2009 02:16 AM



All times are GMT -7. The time now is 05:11 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top