I received my Altair Wave Series 102mm F7 Super ED Triplet APO last week and it arrived damaged with a small, dark scuff/scratch right by the front lens assembly on the dew shield. I took it out for first light and did some imaging (without a field flattener as they were out of the flatteners made specifically for this scope and this is my first imaging refractor so I'm not familiar with picking out a good flattener/reducer). I had to use the Altair star diagonal I bought in order to get my Canon 800D to proper focus. My images are showing the center of focus to be slightly off-center, and the field curvature is extreme in the right 1/3rd of the image, while it is only very mild in the left 1/3 of the image. This does not seem to make sense, as the field curvature should be approximately equal on all sides unless I'm mistaken, and my images are showing that this is far from the case. When I place my laser collimator directly into the focuser assembly and rotate the entire focuser assembly 360 degrees, the laser beam projected through the objective lens scribes a noticeable circle on a dotted paper target.
The reason I bought this scope was so that I didn't have to fiddle around with it for hours like I do with my ES208CF newt astrograph.
Is it normal to have a severely uneven field curvature with this quality of refractor? If not, what would be the steps I should take to fix this issue. I have attached a 45 second exposure to illustrate the issue (please ignore the tracking errors):
Bottom-Left and Bottom-Right Crops:
Thanks in advance,