Using a carefully controlled test environment as articulated by Canon USA, I recently spent some time 'profiling' the exposure performance of my 1D. I used my D30 as a control reference.
I was prompted to do this because I started seeing problems as soon as I started using my 28-70 f/2.8L zoom on the 1D, noting substantial underexposure. Noting comment from some others in the past few months, that the 1D was possibly flawed with respect to the 28-70 zoom, yet further noting Canon's continued silence on this subject, I decided to do my own investigation. Here are the results of my testing. Lens FL 1D D30 16-35 f/2.8L 35 +2/3 +1/3 50 f/1.4 50 +1 +1/3 28-70 f/2.8L 70 +1 +1/3 70-200 f/2.8L 200 +2/3 +1/3 70-200 f/2.8L IS 200 +2/3 +1/3 Thus, a couple of my conclusions are: 1. Specific only to my 1D, it is substantially out of calibration. I'll send it in to Canon USA for repair after an upcoming shoot on Sep. 7th. (I'd send in the D30 too but it's no longer in warranty.) 2. The 1D's exposure calibration varies as a function of focal length and/or lens. This agrees with other comments I have seen that complain that the 1D's exposure accuracy seems to be incorrect with a particular lens, especially the 28-70 f/2.8L, but perhaps not so with others. I'm not convinced there's a specific problem with the 1D's compatibility with the 28-70; instead, I think the 1D has to be exposure adjusted at varying focal lengths. (Details on test procedure and environment: Used a Kodak Q-14 Gray Scale in typical room lighting, manual focus, spot metering, f/8 aperture; K reading from Zone M on the Q-14 should be 55%, plus or minus 5%. With the above exposure compensation amounts, indeed, I obtained the 55% performance. Hope this helps. Bill Neukranz -----Original Message----- From: Robert Meier [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 28, 2002 1:31 AM Subject: RE: EOS 1D problems With what kind of lenses does that happen and with what lenses does it not happen? I do not have a 1D (only 'analog' 1ns) so I don't have a solution. I * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
