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Peter_nap
Tinkerer
Username: Peter_nap
Post Number: 1
Registered: 04-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 06, 2012 - 06:21 pm: | 
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This is my first post so be gentle.
I picked up a Nikkor 55mm 2.8 A1 lens today. It appears to be in mint condition but the iris will not close. It's completely open.
The ring moves freely and the detentes are positive, it just don't do anything.
There are three screws holding a plate on the rear of the lens and that looks like the way in...but that's just a guess.
Any guidance would be appreciated. |
Brcamera
Tinkerer
Username: Brcamera
Post Number: 167
Registered: 08-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 06, 2012 - 10:20 pm: |
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Peter,
With the 55mm f/2.8 Micro Nikkor, stuck diaphragm blades are normally caused by oil on the blades. Although with many lenses you begin from the front, with this lens you begin at the rear by taking off the three lens bayonet screws and removing the bayonet mount. You will then see three smaller screws, usually with red sealer on them - remove these screws and the whole lens assembly will come out through the front of the lens barrel. Then, looking at the rear of the lens assembly you will see three more small screws and these hold the rear lens element and diaphragm assembly in place. After removing these screws you can remove the blades (they will most likely be stuck together with lots of oil) and clean them. Make sure you have good fitting screwdriver blades.
Bill |
Peter_nap
Tinkerer
Username: Peter_nap
Post Number: 2
Registered: 04-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 06, 2012 - 10:33 pm: |
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Thank you Bill! |
Brcamera
Tinkerer
Username: Brcamera
Post Number: 168
Registered: 08-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 06, 2012 - 10:51 pm: |
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Oh- I forgot to mention, after you remove the rear diaphragm/lens element assembly, you will see two screws that actually hold the diaphragm cover to the rear assembly. These screws are 180 degrees apart and they will be evident once you get this far....
Bill |
