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As an experiment I placed a smaller chip camera by the same manufacturer on the filter wheel (i.e., all same adapters save the adapter from FW to camera) and got essentially the same 1 mm error on rotation. I actually did this experiment before doing the dial indicator checks and I was certain that I had revealed an error in the FW, but no, the dial indicator confirmed only ~ 7 microns of error on full rotation after the FW. The only thing remaining was/is the CCD (on both cameras by this manufacturer).
If the reasons for the error are due to the difficulties surrounding cooling and thermal paths, a DSLR test wouldn't have these issues given no cooling.
I'm doubting, but without any proof, that an FLI or SBIG camera would have such a large error.
Peter
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