RCicala
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 p.1 #6 · 20D +17-55 Bad combo? | |
Since I'm the author of the original quoted note, I'll expand a bit: a rental house has to be very up-front about potential problems -- when somebody plunks down their hard-earned they expect to receive working equipment. When it doesn't work, whatever the reason, they aren't happy customers and that's a bad thing. The problem described above is rare. We see it in 1.5% of all rentals, but that's a big deal when the 1.5% has gotten the lens for a special shoot or occasion so we put the warning out to make sure people get the lens in time to test it, not at the last minute.
Now, to expand on the problem: we do see some folks with older XTs and 20Ds who get a 17-55, it gives ERR99 or ERR00 and they send it back, but it works just absolutely fine on every camera we test it on (but we don't have any old XTs or 20Ds to test with). I do not know why this happens, but others have speculated that there is either 1) a different alloy in the electrical contacts of some of the earlier cameras, 2) some older cameras have worn contacts, or 3) the electrical systems in older cameras aren't as robust when it comes to current transfer. From what I do know (talking to some technical repair types) the 17-55 is a very high current draw lens, and if the camera can't handle the current, it 'brown's out' and gives an error.
Roger
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