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Message |
    
Markkal
Tinkerer
Username: Markkal
Post Number: 7
Registered: 08-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, June 10, 2012 - 07:32 am: | 
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Hi friends,
I have a pristine smc Pentax M 28mm 2.0 which has a problem I never encountered before, see pictures.
There is a loose ring inside just behind aperture blades (When seen from backside) which moves around and interferes in half moon fashion with aperture. Blades are all there and they operate so I cannot understand what is the function of this ring, neither by which means it is attached. It looks like there is some glue or dried grease imprint on its rim.
Have removed back elements but to fix it must go past blades removing front block too.. Any suggestions ?? Thanks al  |
Finnegan
Tinkerer
Username: Finnegan
Post Number: 173
Registered: 09-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, June 10, 2012 - 01:07 pm: |
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Try pushing it back up out of the way. If you can get it to "disappear" back up into the inner works then let it fall back down again, put a micro dab of glue on it and push it back up permanently. Don't worry what it is for. Probably a spacer of some sort. |
Markkal
Tinkerer
Username: Markkal
Post Number: 8
Registered: 08-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, June 11, 2012 - 12:38 am: |
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Thanks Finnegan, a dab of glue should do, will try to apply some glue, , get it out of the way and let lens rest upright til glue hardens.. This prevents disassembly of the front block and removal of blades to reach spacer shim located behind them... |
Melko
Tinkerer
Username: Melko
Post Number: 1
Registered: 06-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, June 23, 2012 - 09:26 am: |
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Did the dab of glue work out? I am having excactly the same problem here and I am undecided about just gluing or completely disassembling it. |
