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walter g
Joined: 20 Feb 2010
Posts: 2463
Location: NC, USA
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 Posted: Sat Aug 13, 2011 9:50 pm Post subject: Bad M42 adapter? |
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walter g wrote:
This is shot with a Vivitar 28 2.5 at f8. Shot is at infinity. I think the adapter is to thin and it's going past infinity. I have other shots I can post if it helps.This is the Kiron version.
Tell me what you think.
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Main cameras
Panasonic G5,Nikon J1,Pentax Q10,Sony Nex 6
Minolta MC W SI 2.5/28, MD 2.8/28, MC W SG 3.5/28, MC Celtic 3.5/28, MC W HG 2.8/35, MD Celtic 2.8/35, QE 4/35, Rokkor X 2/45, MC Rokkor X PG 1.4/50, MC Rokkor X PG 1.7/50, MD Rokkor X 1.7/50, MD 2/50, MC Rokkor PF 1.7/55, MC Rokkor PF 1.9/55, Auto Tele Rokkor PG 2.8/135, MC Tele Rokkor QD 3.5/135, TC 4/135, MC Celtic 4/200, MC Tele Rokkor PE 4.5/200
MD 28-70 f3.5-4.8, MD Macro 35-70 f3.5, Md 70-210 f4, MD Rokkor X 75-200 f4.5, MD 100-200 f5.6
Nikon Nikkor 4/20, O Auto 2/35, S Auto 1.4/50..... Miranda Auto 2.8/28, Auto 2.8/35, Auto 1.4/50, Auto EC 1.4/50, Auto 1.8/50, Auto EC 1.8/50,Auto 1.9/50, Auto 3.5/135
Various Soligor,Sun,Fujita,Komura,Spitatone, etc. Lenses
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ManualFocus-G
Joined: 29 Dec 2008
Posts: 6622
Location: United Kingdom
Expire: 2014-11-24
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| Posted: Sat Aug 13, 2011 11:46 pm Post subject: |
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ManualFocus-G wrote:
I've never owned an M42 adapter that stops the lens at infinity! I think manufacturers prefer them to go slightly past infinity, to counter any issues around changing temperatures. Or they're just rubbish at getting the right thickness 
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Graham - Moderator 
Shooter of choice: Fujifilm X-T20 with M42, PB and C/Y lenses
See my Flickr photos at http://www.flickr.com/photos/manualfocus-g |
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Sun Aug 14, 2011 12:10 am Post subject: |
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Attila wrote:
| ManualFocus-G wrote: |
| I've never owned an M42 adapter that stops the lens at infinity! I think manufacturers prefer them to go slightly past infinity, to counter any issues around changing temperatures. Or they're just rubbish at getting the right thickness |
+1 and adapter maker usually make adapters to pass infinity, to buyer send them back if not reach infinity with a lens. Buyers not really care trouble maker is lens not the adapter.
My Pixco adapters for Sony-NEX, m4/3 all pass infinity , need to set all of my lenses to a few mm before infinity mark. Kiwi made Samsung NX adapters I have two of them reach infinity exactly at infinity mark.
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calvin83
Joined: 12 Apr 2009
Posts: 7567
Location: Hong Kong
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| Posted: Sun Aug 14, 2011 2:14 am Post subject: |
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calvin83 wrote:
It is possible to keep the lens stops exactly at the infinity mark if and only if:
camera register distance + adapter thickness = register distance of the adapted lens
If the difference of the value in both side is less than 0.02mm, the lens should stop at the exact/near exact infinity position. High quality adapters made will have a tight tolerance so they will allow more lens reach infinity exactly at infinity mark but they are much expensive than the mass produced budget adapters.
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The best lens is the one you have with you. |
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visualopsins
Joined: 05 Mar 2009
Posts: 11015
Location: California
Expire: 2025-04-11
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| Posted: Sun Aug 14, 2011 4:24 pm Post subject: |
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visualopsins wrote:
| calvin83 wrote: |
It is possible to keep the lens stops exactly at the infinity mark if and only if:
camera register distance + adapter thickness = register distance of the adapted lens
If the difference of the value in both side is less than 0.02mm, the lens should stop at the exact/near exact infinity position. High quality adapters made will have a tight tolerance so they will allow more lens reach infinity exactly at infinity mark but they are much expensive than the mass produced budget adapters. |
Less than 0.02mm for wide angle lens -- distance variation with shorter focal length lens has more effect than with longer focal length.
Some lenses focus past infinity anyway, to provide a compensation range for temperature-related dimensional changes of optics & mechanics.
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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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walter g
Joined: 20 Feb 2010
Posts: 2463
Location: NC, USA
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| Posted: Mon Aug 15, 2011 3:42 am Post subject: |
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walter g wrote:
Thanks everyone.I also noticed but didn't mention that the lens goes past the 12 oclock position. I might try to shim it and recheck it.
I will pickup a battery for my digital caliper so I can check the exact thickness of the adapter.
_________________
Main cameras
Panasonic G5,Nikon J1,Pentax Q10,Sony Nex 6
Minolta MC W SI 2.5/28, MD 2.8/28, MC W SG 3.5/28, MC Celtic 3.5/28, MC W HG 2.8/35, MD Celtic 2.8/35, QE 4/35, Rokkor X 2/45, MC Rokkor X PG 1.4/50, MC Rokkor X PG 1.7/50, MD Rokkor X 1.7/50, MD 2/50, MC Rokkor PF 1.7/55, MC Rokkor PF 1.9/55, Auto Tele Rokkor PG 2.8/135, MC Tele Rokkor QD 3.5/135, TC 4/135, MC Celtic 4/200, MC Tele Rokkor PE 4.5/200
MD 28-70 f3.5-4.8, MD Macro 35-70 f3.5, Md 70-210 f4, MD Rokkor X 75-200 f4.5, MD 100-200 f5.6
Nikon Nikkor 4/20, O Auto 2/35, S Auto 1.4/50..... Miranda Auto 2.8/28, Auto 2.8/35, Auto 1.4/50, Auto EC 1.4/50, Auto 1.8/50, Auto EC 1.8/50,Auto 1.9/50, Auto 3.5/135
Various Soligor,Sun,Fujita,Komura,Spitatone, etc. Lenses
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