I have a 75 minute, 800 ISO (3min x 25) of M45 taken with my new 8 in F3.9 Orion Astrograph and a modified Canon D450 at Okie Tex.You can tell how badly it needs a coma corrector (by the edges) which I have now . Also, the collimation was set using a laser collimator which is not good enough. You can tell by the fat stars on the left side and thinner stars on the right. I did do a defocused star test and you could see the primary mirror still need tweaking. It is not off by much.I do like the star spikes caused by the secondary mirror holder.Dave EisfeldtAttachment(s):-m45_10-17_800iso_75_min_Okie_Tex_Orion_8_in_F3_9_no_coma_cor.jpg (1.9 MB)