So I’m swapping imaging train between my GT81 @384mm for wide field and my RC for galaxies at both 1624 and 1218 (with 0.75 reducer).
I want to switch to an OAG to go with my new QHY268C but am not sure whether to get the ASI290 or 174 mini. The latter will be wasted in terms of FOV as the QHY OAG prism is only 8x8 but I don’t have the backfocus for anything else plus the M54 QHYOAG makes it easy to connect to the QHY268C.
Will the 290 be ok at all focal lengths or should bite the bullet and get the 174? Any other options to consider?