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Kldill
Tinkerer
Username: Kldill
Post Number: 1
Registered: 11-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, November 09, 2008 - 06:15 pm: | 
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Can anybody point me in the right direction for repairing/cleaning sticky aperture blades on a Tamron Adaptall CT-105 105mm f2.5 lens? They seem to have oil on them and the aperture sticks wide-open. Any help would be appreciated!
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Rick_oleson
Tinkerer
Username: Rick_oleson
Post Number: 719
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, November 09, 2008 - 08:43 pm: |
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I've never worked on that one. Usually, you go in from the front, unscrewing the ID ring first and then the front lens cell... but construction varies, some you unscew the filter thread ring, or remove some set screws from the sides at the front end to get started. Once you reach the blades, clean them with lighter fluid until they are totally dry. Any oil around the actuating ring that they attach to should be cleaned out as well. |
Kldill
Tinkerer
Username: Kldill
Post Number: 2
Registered: 11-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, November 14, 2008 - 07:17 pm: |
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I've read about using lighter fluid to clean the blades, but just how do you go about cleaning them? What do you actually use to apply the fluid? How much fluid is used? Etc, etc. I'm looking for a how-to reference for a newbie. I don't want to flood the thing or touch something I shouldn't & ruin it. It's a beauty and other than the stuck aperture, looks new.
Thanks! |
Sevo
Tinkerer
Username: Sevo
Post Number: 16
Registered: 09-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, November 15, 2008 - 02:16 pm: |
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Never use lighter fluid on any lens that has not been completely disassembled!
Ideally, you would take the aperture completely apart as well - but if you want to avoid that, soak the entire aperture (removed from the lens body, of course) in lighter fluid, and repeat until the bath stays clean. Let completely dry, and use a hair or thin needle to apply a very minuscule amount of camera safe oil (e.g. Nyoil) to each of the blades pivot pins before reassembly. |
Glenn
Tinkerer
Username: Glenn
Post Number: 452
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, November 15, 2008 - 06:26 pm: |
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Once all the optics are removed, many lenses can have their iris mechanisms flush cleaned without further stripping down. It all depends on the actual layout of the lens barrel.
You do not need to apply oil to the blade pivots - the object of the cleaning was to remove all oil present! I have never come across any aperture mechanism that did not work perfectly dry. I am talking about lenses that made 1000s of exposures between service checks, and not half a dozen rolls per year. |
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