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12-16-2011, 11:39 PM   #1
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Sticky Diaphragm

I noticed today that my elderly SMC 50mm F4 macro wasn't stopping down when I pressed the shutter release.

Pulled the lens off the body and had a look at the back of the lens. I discovered that when set to a focus distance of more than about 0.7m, the diaphragm "sticks".

At shorter focus distances, the aperature lever moves smoothly and the diapragm blades open / close as they should when I move the aperature lever by hand.

I ** think** the "stickiness" is related to the movement of the lever mechanism and not the diaphragm blades themselves.

Any suggestions?

12-17-2011, 07:14 AM   #2
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It sounds that way- but you'll likely have to open the lens up to see what's what!
12-17-2011, 08:04 AM   #3
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QuoteOriginally posted by CP140 Quote
I noticed today that my elderly SMC 50mm F4 macro wasn't stopping down when I pressed the shutter release.

Pulled the lens off the body and had a look at the back of the lens. I discovered that when set to a focus distance of more than about 0.7m, the diaphragm "sticks".

Any suggestions?
If you have critical use for the lens,
and don't want to fiddle around with it yourself,
it would be worth getting it repaired.

I don't know where to try in BC,
but if you don't anticipate customs problems,
Eric Hendrickson in Tennessee has a good reputation.
Here's a link to his home page: Home
12-17-2011, 08:26 AM   #4
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Take the advice from “lytrytyr” and send your lens to Eric for repairs.

Do not use these local camera repair shops:

Vancam Service – 1666 West 8th, Vancouver
Camtex Camera Services – 201-32 West 5th, Vancouver

Their technicians are not skilled enough for a job like that and will ruin your lens.

Phil.

12-17-2011, 06:20 PM   #5
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Thanks for all the info everyone... particularly where not to go (!)
12-17-2011, 08:57 PM   #6
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I sent my M50/4 Macro to Eric and he returned it to me in Like New condition. His prices are very reasonable too.
12-17-2011, 10:58 PM   #7
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You can try Ralph Innes, he is in Port Alberni and here is the link to his website. You might email him and see if he still does lens repair. Repair Resources & Rates
12-18-2011, 11:24 AM   #8
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Thanks. I'll fire off an email to him... "local" would be better than having to deal with customs!

12-18-2011, 05:40 PM   #9
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Just a quick update here... I've been in touch with Ralph Innes. He's still doing lens work.... I'm now in his queue...
12-21-2011, 01:13 AM   #10
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Thanks, that's good to know, I have a few I would like him to take a look at.
10-25-2012, 05:40 PM   #11
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Just an FYI here... Ralph is having to severely curtail his lens repair work... so I'm back in the market for a lens repair guy. Guess it's time to talk to Tennessee
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