Quote Originally Posted by Michael R View Post
Alan, if this is repetitive apologies, but have you seen this type of diagram (attached)? It's a simplified picture to illustrate what goes on in the case of lens tilt (for example). Might help in visualizing what happens and aid in the discussion.Click image for larger version. 

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Thanks for that. I just thought it was strange the way the portion in the middle came up slightly out of focus. I guess that has to dow with the movement I made? But it's hard for me to visualize.