How do you adjust a Copal No. 3 shutter (1 stop slow @ 125th sec.)

[Will Thompson]

Paul, Yes My Calumet shutter tester is VERY accurate. It shows my T90 to be within 1/6 of a stop from 125th to 4 seconds. What little variance that it has I attribute to the T90 age. I tried My EOS 1Vhs but the shutter has a constant speed with the back open.

I have had my Century B&L shutter open down to the shutter leaves and back together with the only problem being the bad mechanical design. (Mounting it warps the housing enough to need a complete overhaul.) The Copal No. 3 is a thousand times better!

This is the type of thing I do all day long at my day job.

Shutters are easy, just remember to open them in a gallon ziplok bag or you will be making replacement springs all day long!

[Pete Watkins]

I'll second Flutots. The service that I recently recieved was superb and I wouldn't hesitate to use the company again. It was well worth the cost of sending the shutter across the pond.
Pete.

[Turner Reich]

Go for it, it'll be an experience you will never forget and one that you will tell everyone about for years to come.

Really, don't even bother, If you don't have the tools or if you do have the tools then you need to know how and If you did know how then you wouldn't have to ask here. I suppose asking though is a way to find out if it is easy or possible. It's neither.

[Will Thompson]

it'll be an experience you will never forget and one that you will tell everyone about for years to come.

I doubt it.

Now then, Repairing a Resonex MRI machine without a service manual or schematic on 6 different occasions all being different failures is something I still mention from time to time.

[riooso]

Mr. Thompson let us all know how you come out on it.

Take Care,
Richard

[JimL]

As far as I know, Copal shutters times are not "adjustable" per se. They were designed for mass-production and are made to a tolerance of +/-20% on the speeds. This may be more information than you want or need, but sometimes on the speed setting ring (an internal, punched sheet metal ring with steps that control the timing), you see grooves where the metal has been punched to push it out a bit and tweak the speed. As others have noted, speeds that are too slow are often due to dried lubricants. If you're mechanically inclined and like taking things apart, it's not terribly hard to get at the insides, but a CLA is worth it to do the job properly.

HTH,

Jim