Back Focus Revised - New Info...

Started Dec 29, 2005 | Discussions thread
OP PhotoLeon1935 Senior Member • Posts: 2,305
On keystone

There is so much keystone introduced by tilting the target that you would not be able to do an adustment based on keystone. Focus and keeping the lens to sensor distance equivalent to the distances reflected to the eyepiece and the auto focus sensor is the primary concern.

I have faith that the production specs on milling the square image box would have zero keystone (practically) if the A,B, C image paths were equal.

I have been wrong before and know how to repent, but knowing how easy it is to be wrong, I still listen to all arguments. Thank you, I am still thinking about it.

I can see that swinging the small mirror on an arc which is probably in the same arc as the stop pin would have minimal effect on autofocus. I would accept a coin toss on that decision.

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