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Kathmandu
Joined: 09 Dec 2009
Posts: 1477
Location: Pacific Northwest, USA
Expire: 2012-04-08
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 Posted: Wed May 04, 2011 7:45 am Post subject: Mamiya Sx lens auto diaphragm pin modification and adapting. |
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I have done this a few times now and thought I should share it here. The auto diaphragm pin mod. is very popular and I am sure most of you are familiar with it.
The Sx lenses have an additional problem , that is the aperture ring has a rim that rises higher than the plate of the mount, which hampers the free movement of the aperture ring, and there is also the loss of the ability to focus to infinity. My apologies for any typos.
This was done on the Auto mamiya/sekor sx 105mm f2.8.
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kathmandu
Sony α 700 DSLR
Last edited by Kathmandu on Wed May 04, 2011 7:54 am; edited 1 time in total |
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Kathmandu
Joined: 09 Dec 2009
Posts: 1477
Location: Pacific Northwest, USA
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| Posted: Wed May 04, 2011 7:48 am Post subject: |
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kathmandu
Sony α 700 DSLR
Last edited by Kathmandu on Wed May 04, 2011 7:51 am; edited 1 time in total |
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Kathmandu
Joined: 09 Dec 2009
Posts: 1477
Location: Pacific Northwest, USA
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| Posted: Wed May 04, 2011 7:50 am Post subject: |
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kathmandu
Sony α 700 DSLR
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Schnauzer
Joined: 09 Apr 2008
Posts: 1991
Location: Maine, USA
Expire: 2012-03-08
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| Posted: Wed May 04, 2011 11:43 am Post subject: |
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Nice work and nice tutorial. Thanks
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Ron |
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Katastrofo
Joined: 26 Feb 2007
Posts: 9067
Location: USA
Expire: 2012-11-18
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| Posted: Wed May 04, 2011 1:02 pm Post subject: |
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| Agree, well done! |
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sichko
Joined: 20 Jun 2008
Posts: 1896
Location: South West UK
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| Posted: Wed May 04, 2011 3:03 pm Post subject: |
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Nice account. Thanks.
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John |
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IRR_DC
Joined: 09 May 2011
Posts: 1
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| Posted: Mon May 09, 2011 1:29 pm Post subject: |
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This is fantastic.
I'm having trouble unscrewing that aperture status pin with tweezers/needle nose pliers. Anyone have some tips on getting that pin out?
Best,
Isham |
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Kathmandu
Joined: 09 Dec 2009
Posts: 1477
Location: Pacific Northwest, USA
Expire: 2012-04-08
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| Posted: Fri May 13, 2011 12:50 am Post subject: |
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Schnauzer,Katastrofo,sichko, & IRR_DC: Thanks a lot .
Isham ,it would be nice to see some pictures with your newly adapted lens.
Update:He was able to get the pin out with persistence.  . He was able to pull it out unscrewing it clockwise. These pins are not threaded and some require a little persuasion and persistence.
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kathmandu
Sony α 700 DSLR
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quique_fs
Joined: 29 Jul 2011
Posts: 2
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| Posted: Fri Jul 29, 2011 5:05 pm Post subject: |
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I'm having trouble with unscrewing the aperture pin. Could you tell me if it is clockwise or counterclockwise?
I suppose I'll try "persistence", but right now the pin is winning me in that... xD |
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Kathmandu
Joined: 09 Dec 2009
Posts: 1477
Location: Pacific Northwest, USA
Expire: 2012-04-08
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| Posted: Fri Jul 29, 2011 6:26 pm Post subject: |
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| quique_fs wrote: | I'm having trouble with unscrewing the aperture pin. Could you tell me if it is clockwise or counterclockwise?
I suppose I'll try "persistence", but right now the pin is winning me in that... xD |
I went over this exact same problem with someone before-and his was anticlockwise. Mine was clockwise. Which makes me believe the pin is not threaded in. Its either glued or put in there when hot?.
The thing to do is to put some isopropyl alcohol or similar solvent over the pin-a dab, not much. Grab the pin firmly -with a pair of tongs ,or any thing that has grip on it- then wiggle it slowly , turning clockwise and then anticlockwise-until it comes out.
Hope it works for you. 
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kathmandu
Sony α 700 DSLR
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quique_fs
Joined: 29 Jul 2011
Posts: 2
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| Posted: Sat Jul 30, 2011 9:26 am Post subject: |
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Thank you very much por your answer. I also think that the pin is inserted by pressure instead of screwed.
I'll try the isopropyl alcohol, because the pin is firmly stuck and I can't get it out. I'll tell you if I have success  |
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Kathmandu
Joined: 09 Dec 2009
Posts: 1477
Location: Pacific Northwest, USA
Expire: 2012-04-08
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| Posted: Sat Jul 30, 2011 6:46 pm Post subject: |
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| quique_fs wrote: | Thank you very much por your answer. I also think that the pin is inserted by pressure instead of screwed.
I'll try the isopropyl alcohol, because the pin is firmly stuck and I can't get it out. I'll tell you if I have success |
Cool, sounds good -also may try hair dryer at warm setting with back cap of lens closed -of course you don't want to melt anything.
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kathmandu
Sony α 700 DSLR
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