I have been following the forum for some time but this is the first topic I'm posting about.
A number of months ago I switched from a DSLR to a ASI183MM-Pro since doing so I have been having issues with elongated stars and I'm not sure what's happening "images below." I did not have this issue while using the DSLR. I'm not sure if this is from sensor tilt, focuser sag or would guiding do this? Hopefully the images I attached will assist. I have a before and after Meridian flip images.
The scope I use is an AT60ED with a Astro-Tech .8x reducer/field flattener "ATRF60." I do have the 55mm of back focus suggested for the reducer. I am using ZWO filters and 5 position filter wheel.
Please let me know if any other info or images are needed and I appreciate the help.