Quote:
Originally Posted by Ukastronomer
Surely no scope needs spacers between the diagonal and scope with eyepieces, I just place the DSLR on the diagonal
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I wouldn't want to put the DSLR on the diagonal - you get an extra element between the sensor and the objective on which dust can settle.
But the elements I'd neglected to think about were filter wheel and OAG. I think that might explain the design.