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Dennis, the difficulty I found was not so much the problems themselves; it was identifying what parts of the problem existed. It is easy to get caught up thinking one thing is the primary fault such as differential flexure and it being more like a combination of errors and at this focal minor errors shown up nicely in the images. And this is not to say that the very problems you faced are not present also in the conundrum I face. Good suggestions for things I need to check out of thoroughness.
Perhaps a screwed on focusor and screwed on camera too???
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