Canon's high-end old EOS bodies had a feature (tech-accessible only) for reporting exposure/frame or roll count and system errors, using a proprietary computer and hot shoe connection on the service bench.
Originally Posted by Wolfeye
When I purchased my EOS 1N off eBay some years ago, this test was requested by me (additional to others) after purchase to validate the seller's claim it had "shot less than 50 rolls". The bench test confirmed it was much less: 32 in fact and no unrecoverable errors to speak of.
A cable release is not strictly necessary. Engage the self timer on EOS bodies, or for the EOS 1, 1N, 3, the 2 second self-timer with mirror lock-up in the absence of a release.
Last edited by Poisson Du Jour; 07-22-2009 at 05:05 AM. Click to view previous post history.
“The photographer must determine how he wants the finished print to look before he exposes the negative.
Before releasing the shutter, he must seek 'the flame of recognition,' a sense that the picture would reveal
the greater mystery of things...more clearly than the eyes see." ~Edward Weston, 1922.