Quote Originally Posted by mgb74 View Post
First, even a proper CLA won't necessary make all speeds exact. I've seen, multiple times, test results after CLAs where tested speed might be off by as much as 30-50% on the slow end. And I'm talking about test results provided by good repair techs. I assume that the mechanics of making one speed correct might alter a different speed. And I assume it also depends on both the initial build quality and the subsequent wear on the shutter.

So being a 1/3 stop off at 1s isn't has much a concern (at least if it was my lens) as a 1/2 stop off at 1/60.

I'm no expert, but it does seem a CLA is in order. But, out of curiosity, did you discover the discrepancy on film or just with your tester?
Then they didn't do much of the "A" part. "CLA" means clean, lube, adjust. If a shutter is in good enough condition to give consistant speeds, it can usually be adjusted to be pretty close- say 10%-15% to the marked speeds. More than that is unacceptable, unless there's a good reason.