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Regards using it without the reducer, to an extent it is just a matter of plonk the camera on, find focus and go. Apparently the way the two mirrors interact means that as you move the primary mirror up and down the cell, the effective focal length changes slightly, but I never noticed any significant difference.
I eventually found the reduction in coma with the reducer more valuable than the extra focal length without it so most of the imaging I did prior to selling my C925 was with the reducer.
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