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Originally Posted by stringscope
Hi Ed,
To me the inclined eyepiece axis 2 mirror concept is probably preferable to the 3 mirror concept due to simplicity, although I assume you can get a much lower EP height with the 3 mirror option.
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No, the two mirror option gives lower eyepiece position for the same central obstruction as a 3 mirror system. . The third mirror moves the eyepiece back up the tube with the 90 degree reflection ( as compared to 45 degree angle in the two mirror system) , but is much easier to baffle than the two mirror system. Private communications I've had with Dan suggest he is still battling with skylight flooding the field, in his two mirror system despite the complex baffle he has .
My personal option would be a faster mirror and a coma corrector ,rather than folding.
Mark