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04-05-2009, 03:53 PM   #1
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wd-40, silicone spray??

hi...
just purchased a vivitar (komine) 70-210 f2.8-4 lens, found that getting the lens to lock in on the 'a' setting was a bit 'tight'.... finally able to get the pin out of it's little hole....
is wd-40, applied oh so carefully to the pin itself be good or bad...
also, silicone spray perhaps...
noting both would only be applied with a toothpick... hopefully with surgical precision..
thanks..

04-05-2009, 04:29 PM   #2
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WD40 solvent destroys greases and plastics, and it spreads to a very thin film. I wouldn't trust even a toothpick application for fear it would migrate inside your lens. Silicone spray I have no experience with, but I'd suggest some form of stable grease, applied with the aforementioned toothpick.
04-05-2009, 04:47 PM   #3
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QuoteOriginally posted by dcmsox2004 Quote
... a vivitar (komine) 70-210 f2.8-4 lens, found that getting the lens to lock in on the 'a' setting was a bit 'tight'.... finally able to get the pin out of it's little hole....
is wd-40, applied oh so carefully to the pin itself be good or bad...
also, silicone spray perhaps...
Neither.

It's something else making it "tight." Lack of lubricant is not the cause (BTW, WD-40 is not a lubricant).

Find the cause and fix it once and for all. You may need to perform some lens surgery, however.
04-05-2009, 06:14 PM   #4
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QuoteOriginally posted by dcmsox2004 Quote
hi...
just purchased a vivitar (komine) 70-210 f2.8-4 lens, found that getting the lens to lock in on the 'a' setting was a bit 'tight'.... finally able to get the pin out of it's little hole....
is wd-40, applied oh so carefully to the pin itself be good or bad...
also, silicone spray perhaps...
noting both would only be applied with a toothpick... hopefully with surgical precision..
thanks..
I think that if you value the lens, you should take it to a good camera repair shop and have them dissemble the lens and clean out the old lubricant and re-lubricate it with the proper lubricant. If the lens is old any lubricants in the lens could be hardened or dirty. Don't try to disassemble the lens yourself unless you have the proper tools, or don't care if you ruin the lens.

04-05-2009, 07:02 PM   #5
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I've done similar "surgery" before, but applied a small amount of silicone grease with a toothpick, and that solved the problem of a sticky f-stop ring. I suppose some non-petroleum-based grease (maybe like moly or lithium wheel-bearing grease) would also work.

-Joe-

QuoteOriginally posted by dcmsox2004 Quote
hi...
just purchased a vivitar (komine) 70-210 f2.8-4 lens, found that getting the lens to lock in on the 'a' setting was a bit 'tight'.... finally able to get the pin out of it's little hole....
is wd-40, applied oh so carefully to the pin itself be good or bad...
also, silicone spray perhaps...
noting both would only be applied with a toothpick... hopefully with surgical precision..
thanks..
04-05-2009, 08:15 PM   #6
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Since this is an electrical contact, and you have gotten it to work, I wouldn't do anything. The A position is much more useful than using the aperture ring. (I suppose you might need the ring if you're using non-A macro tubes.) Grease or spray or WD40 might get on the camera contact and cause problems with other lenses.
04-05-2009, 09:59 PM   #7
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WD-40 is not good to use

WD-40 turns to a hard grease after the volatiles evaporate. Gun repairer's take apart a log of gun actions that don't work after being repeatedly sprayed with wD-40. I can't imagine it has any place around a lens.

Phil
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