On Thursday, Oct 16, 2003, at 15:18 Europe/London, William Davies wrote:
However, It makes sense to me that a Canon engineer who has worked on the design of an Auto focus system can come up with a design for a rig capable of testing the correct operation of that system. Anyone else may be able to come up with a design which will test the system, BUT they may be testing the limits of the system, rather that it's correct operation. As a result, a camera could be returned to Canon with reported back focusing problems; Canon can't reproduce the fault, but adjust the camera to front focus, to keep the customer happy - the photographer now has a camera which appears to work on his home made test rig, but in the 'real world' is actually front focusing...
The real world is all that matters here. My 10D went back. I do not care what a test rig says, if a model is out of focus the camera is useless. I did do a quick test and found back focus but this was not enough to explain completely soft portraits. The answer was simple yet painful, I bought a 1Ds. I am now once again in awe of the process of being a photographer with a rekindled enthusiasm for the job I have't felt for many years.
Here are a couple of thoughts I have found on the web:
What area is covered by the AF sensor? It's probably not exactly the same area displayed in the viewfinder, so it's possible that the camera is finding something to focus on, outside the focus point shown in the viewfinder.
Apparently the sensors extend beyond the guide marks on the screen. I want the 10D to work as I will need a backup camera. I am sure most do.
regards
Jonathan Keenan
=============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
