LindV

I'm wondering if it's because the light panel i'm using is too bright hence it calculated and used a shorter exposure time. I will try to lengthen the exposure time and see if it makes any difference. I was doing some more research and i'm wondering if i attached my camera incorrectly to the filter wheel. Currently using an M54 adapter to attach the camera to the filter wheel WITH the tilt plate still attached. But i found this image stating the tilt plate needs to be removed and camera screwed onto the EFW. I will do some tests once i'm off work to see if that is the issue. It does seem plausible now that i'm seeing this image and the tilt plate is probably spacing the sensor too far from the filter. EDIT: I may have misunderstood the diagram and probably need to keep the tilt plate on. I'm now wondering if it's the M54 ring i'm using to attach the camera to the filter wheel causing the obstruction. I may need to take the ring out and directly screw the camera onto the filter wheel back plate instead.

That makes sense, my original thought was some sort of obstruction but just couldn't figure out if it was the problem or where it's stemming from. I do notice the lights showing similar pattern without flats which i've never seen before when i used an ASI533 camera. Attached is M31 i was testing out recently and i do notice the rainbow banding around the galaxy like some sort of reflection within the tube somewhere. I think i have the orientation correct, currently have the flat side facing the telescope and the ZWO lettering bulky end facing the camera. Correct me if it's incorrect.

I did and the images turned out worse than without flats. Yes, i figured it looked off as my usual flats never looked like that, but that was with an ASI533MC Pro with a smaller sensor. I will try to upload my other calibration frames when i get home from work. I usually take my flats after my imaging session with a white t-shirt and a light panel. ASIAir calculates the exposure time, i believe for this flat was around 330ms. Yes it is a full frame camera. The Esprit 120 with flattener (no reduction) is 44mm image circle, while the sensor for the ASI2400 is 43.3mm. My current image train starting from the focuser is Focuser -> Flattener (Needs 75mm back focus) -> M62 to M48 Adapter (20mm) -> M48 Spacer (16.5mm) -> M48 to M54 Adapter (2mm) -> ZWO Filter Wheel (20mm) -> Camera (16.5mm to sensor with tilt plate) Could the M48 spacers be the issue not being wide enough for full frame? Many thanks and much appreciate all the replies!

Was trying out the ZWO ASI2400MC Pro on the SW Esprit 120ed, after my imaging session with M31 on a moonless night, i was finishing up with my flats. When i was loading them up on my laptop, i noticed my flats look a little different to my usual flats with another camera. Will this still be usable for calibration? Attached image is unstretched.

I gave that a try, but the nose piece doesn't stay secure in the helical focuser of the OAG. I also tried to remove the helical focuser and directly attach the camera that way, but doesn't seem like any of my spacers fit the threads where the focuser went. EDIT: I completely forgot i removed the thumb screws from the focuser hence why i couldn't secure the nose piece adapter. Let me retry again and see if i can also adjust the prism height to achieve proper distance. EDIT 2: Unfortunately didn't help much in distance. I will try again after work and experiment some more. EDIT 3: Does anyone know what size male threads is used to attach to where the helical focuser goes on the OAG? I may need to order in a step-down adapter to go from M42F to whatever size male threads to directly attach the camera to the OAG without the focuser for it to work out.

Hey everyone, Hope someone can help me with achieving the correct back focus on my image train. I am trying to fit a Celestron OAG onto my Esprit 120 using the stock field flattener but it has been quite challenging so far. I believe the distance the guide cam sensor to the prism needs to match the distance the main imaging camera's sensor to the prism as well. I seem to have the correct distance for the imaging cam sensor to the flattener at 75mm, but main sensor to the prism is 25mm, while the guide cam sensor to prism is 55mm. Does anyone have any thoughts about how i should go about achieving the correct distance and what adapters i will need (I'm mainly using the adapters that came with the OAG and cameras)? Thanks!