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Niko Koskela
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 15, 2005 - 11:10 pm: | 
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I have disassembled a SMC-Takumar 1:1.4 50mm for deep cleaning. When putting it together i repeatedly end up with the same problem. The aperture ring turns normally, but turning the aperture ring from f11 to f16 doesn´t have any effect on the aperture. I have not been able to find a way to correct this. "Googling" for this problem only found me a couple of referrals to "aperture calibration", but not any instructions to do it. Could anyone help me ?
Cheers, Niko |
rick oleson
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 16, 2005 - 09:51 am: |
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Here's how I do it, if I don't have the correct settings recorded:
With the glass out, measure the diameter of the diaphragm fully open. Now multiply this by the maximum aperture of the lens (1.4) and then divide by the minimum aperture (16). This gives you the diameter that the opening should be when stopped down to f/16.
Now, pick out of your tool box a drill bit of this diameter, or as close as you can get, and use this as a gauge to set the diaphragm to at its smallest opening. Once you have this locked down, it all should work.
rick : ) = |
rafadavidc
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 16, 2005 - 09:19 pm: |
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i've got a shitty 50mm f/1.4 that i'd like to clean. how'd you take that sucker apart?
--RC |
Niko Koskela
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 17, 2005 - 12:46 am: |
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Rick, thank You !
rafadavidc, Chris Sherlock might be able to help you: http://homepages.ihug.co.nz/%7ESrawhiti/pentax50mmf1.4.html
Niko |
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