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Thanks, Bojan for those links, I am starting to recover my rusty optics knowledge. Googling around I did come across a post on a non-IIS forum which stated the the eyepiece in an eyepiece projection set up had to have a focal length close to the diagonal dimension of the DSLR sensor. That is consistent with my finding that the 25mm EP works. The post didn't explain the reason for this rule of thumb. I also now understand that varying the position of the eyepiece in a projection alters the magnification rather than the focus.
Cheers
Kevin
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