I mentioned to my local calera seller yesterday that I had heard an opinion from one of the Boffins on the mail list I inhabit that there was a possibility that my lens was defective. It happened that they had a second one in stock, so I was given the offer of bringing my lens in for an exchange if the lens on the shelf turned out to be a better performer. Today we compared the two lenses, and they were as close to identical in AF speed as we could determine without using a stopwatch. It looks like I have a "good copy" of the lens, but the lens itself isn't good for AF speed. OTOH, the glass itself is superb. If we ever get a nice day that coincides with a day off, I might just take my herd of 50mm lenses out and see which one is the best.

William Robb

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