I got myself a camera upgrade from a Canon 450d to a Nikon D5300 and has been looking forward to trying it out. Last night was clear so i decided on shooting the Andromeda galaxy. PA was good and the mount was tracking as good as it normally does(less than 1" rms). But my stars came out weird. I went through my whole setup to make sure everything was ok: rechecked balance, new PHD2 calibration etc. but no matter what i did the stars came out weird. At first i thought it was down to a tracking issue since the Nikon has smaller pixels than the Canon and requires better tracking, but after some shots all the pictures looked exactly the same. The focus was done like i always do with the FWHM assistant in backyard canon/nikon and telescope was freshly collimated and had cooled down to ambient temperature.
Optical train is: Camera --> TS Maxfield Coma Corrector --> TS Photon F5 (GSO) - Both camera's using a standard M48 to bayonet adapter screwed on to the CC.
120s exposure: https://i.imgur.com/CLtuJe7.jpg
40s exposure: https://i.imgur.com/v1mpnXY.jpg
After looking at the 40s exposure today the stars look like little circles.
The only thing i had changed on my setup was the camera, so i went inside and dug out trusty Canon 450d i have used many times before and put it on the telescope. After re-focusing the stars came out fine, like they used to do.
120s exposure: https://i.imgur.com/ITxUY7N.jpg
No processing was done to the images linked, just converted to jpg. I am a bit baffled by this, so i am hoping someone can point me in the right direction of what to look at to resolve the issue. Any help is much appreciated.
Edited by Rhinottw, 22 September 2019 - 04:34 AM.