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cheve
Joined: 31 Mar 2009
Posts: 182
Expire: 2011-12-06
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 Posted: Tue Jul 27, 2010 6:35 pm Post subject: quest: dismounting M42 lens from EF-mount body |
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cheve wrote:
All,
how do you prevent your lens from unscrew itself off the M42-to-EOS adapter when the lens and adapter is mounted on the camera body already?
I have both flanged and non-flanged type adapter off x-bay, and it is annoying whenever I try to dismount the M42 lens for lens of different mount.
Any thoughts?
Cheers,
_________________
Adaptall-2: 17/3.5(51B),80-210/3.8-4(103A),60-300/3.8-5.4(23A) C/Y: CZ 35-70/3.4,RMC Tokian 80-200/4.5
EXk: Topcor Re Auto 35/2.8(broken),135/3.5, Steinheil Culminar 135/4.5 Leitz-R: 50/2,90/2,180/4,180/3.4,Angenieux 35-70/2.5-3.3
M42: pentacon 135/2.8,135/2.8(preset),Super-Takumar 55/1.8,Meyer-Optik 50/1.8 FD: Voigtlander 125/2.5 SL
K: smc 50/1.2, porst 55/1.2, Takumar(Bayonet) 135/2.5 Minolta: rokker 58/1.4,58/1.2 nikkon: Nikkor H Auto 300/4.5
OM: 21/2,21/3.5,28/3.5,50/1.2,300/4.5,500/8,35-70/3.6, viv 17/3.5,viv 28/1.9,viv 135/2.3
Rollei: Voigtlander Color-Ultron 55/1.4 AR T: Tele-Astranar 135/3.5
EF: 30/1.4(Sigma),50/1.8,28-70L,80-200L,24-105L,70-300DO,18-200OS(Sigma)
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AhamB
Joined: 22 Jun 2008
Posts: 733
Location: Germany
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| Posted: Wed Jul 28, 2010 8:18 am Post subject: |
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AhamB wrote:
Huh, I've never had that happen. I have two m42 lenses and they mount tightly on my adapter, so they will never unscrew when I simply want to take off the adapter from my Canon body. Does the adapter take a lot of force to unmount? I bought one m42 adapter with a mount that was so rough that I didn't want to mount it on my camera, I just threw it away. |
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mmelvis
Joined: 24 May 2010
Posts: 1326
Location: Florida,USA
Expire: 2015-05-09
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| Posted: Thu Jul 29, 2010 2:38 am Post subject: |
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mmelvis wrote:
Blue colored Loctite on the mount and they will not separate. Loctite can be purchased at an auto parts store.
Understand when you do this the lens will not come off the adapter.
DO NOT PUT LOCTITE ON YOUR CAMERA BODY, only put on the adapter where the lens screws in.
Last edited by mmelvis on Thu Jul 29, 2010 3:13 am; edited 1 time in total |
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IAZA
Joined: 16 Apr 2010
Posts: 2587
Location: Indonesia
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| Posted: Thu Jul 29, 2010 3:12 am Post subject: |
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IAZA wrote:
I never have problem with m42-eos adapter, but I have it with exakta-eos adapter. I just hold the proturing part of Exa lens with my finger to prevent it fall.
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nex5, Olympus EPM1, yashica half 14, Canon eos 650 want to see samples of mine? please click My lenses
and My gallery
~Suat~ |
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visualopsins
Joined: 05 Mar 2009
Posts: 10961
Location: California
Expire: 2025-04-11
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| Posted: Thu Jul 29, 2010 3:46 am Post subject: |
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visualopsins wrote:
Actually I consider this a feature; lets me change M42 lenses just like on Spotmatic. When I want to remove lens and adapter I just screw lens on a little harder, then both lens and adapter remove easily -- it doesn't take much more than enough to prevent unscrewing when focusing a lens with stiff helical.
Re: Locktite -- there are differing 'grades' some of which can be broken with minimal effort; suggest using the weakest 'grade', or maybe better, a few dabs rather than completely filling the entire circumference -- even the weakest 'grade' will hold very tightly if the entire circumference is filled.
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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cheve
Joined: 31 Mar 2009
Posts: 182
Expire: 2011-12-06
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| Posted: Fri Jul 30, 2010 2:48 pm Post subject: |
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cheve wrote:
All.
Thanks for your comments.
When screwing/mounting the lens to the adapter, I do not want to tighten too much -- fearing of damaging the threads on the lens(and I will be really "screwed"). This would be the reason why my lens unscrews itself from the adapter as I try to dismount it(ie. lens + adapter) from the camera. I don't want to glue the adapter to the lens, since I want to share the adapter with my other M42 lenses.
Currently, when I put the lens to adapter, I would stop turning the lens as soon as I feel there is some resistance. May be I just have to screw the thing in more tightly? How do you determine your M42 lens is screwed in properly?
I also have the same issue with my EXK adapter as well.
I am using objects like ball pen point with hard tip to dis-lodge the adapter off the camera. It works but not too satisfying 
Cheers,
_________________
Adaptall-2: 17/3.5(51B),80-210/3.8-4(103A),60-300/3.8-5.4(23A) C/Y: CZ 35-70/3.4,RMC Tokian 80-200/4.5
EXk: Topcor Re Auto 35/2.8(broken),135/3.5, Steinheil Culminar 135/4.5 Leitz-R: 50/2,90/2,180/4,180/3.4,Angenieux 35-70/2.5-3.3
M42: pentacon 135/2.8,135/2.8(preset),Super-Takumar 55/1.8,Meyer-Optik 50/1.8 FD: Voigtlander 125/2.5 SL
K: smc 50/1.2, porst 55/1.2, Takumar(Bayonet) 135/2.5 Minolta: rokker 58/1.4,58/1.2 nikkon: Nikkor H Auto 300/4.5
OM: 21/2,21/3.5,28/3.5,50/1.2,300/4.5,500/8,35-70/3.6, viv 17/3.5,viv 28/1.9,viv 135/2.3
Rollei: Voigtlander Color-Ultron 55/1.4 AR T: Tele-Astranar 135/3.5
EF: 30/1.4(Sigma),50/1.8,28-70L,80-200L,24-105L,70-300DO,18-200OS(Sigma)
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