Quote:
Originally Posted by PRejto
I know this is an old post but people read old posts when searching and I don't want to leave up any bad information.
After much experimentation I can safely say that the cause of my R/B focus offsets was due to the flattener (and not the flattener position). With the flattener installed - using 3 cameras and 3 different sets of filters - testing all showed this large offset with the flattener and all showed essentially no focus shift with the flattener removed. The flattener position was vetted by 3 experienced people as dead on but nevertheless I experimented with positions up to 3 mm in either direction with no change observed in the focus offset. I then installed a TAK flattener and checked it at a range of positions with no focus offset in any position. Case closed!
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That must be a relief Pete
.. sounds like you went through a bit of a saga to get to the bottom of it? Good news
Mike