First time doing multiple nights of imaging. I believe i did not properly frame each night. Can you correct when processing? I processed through Sirilic  |
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I don't know if you can salvage this and have enough of the image in "common" and have something you would be happy with. It does look like you can see the groupings of your frames from each nights session. It looks like 3 nights of subs??? Anyway, pick a night with your best subs. Prune (discard) the remaining data. Then plate solve a sub from the night you kept and make sure you plate solve and rotate your camera to match that frame for any future imaging sessions. I have an Observatory and my equipment is as static as it gets. I still verify camera angle when starting an imaging session. (I could have moved something when switching a filter/filter drawer…). But the difference between your sessions is a lot and this way you can keep some of your data…
Wish I had a more favorable response…
CS Tim
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Did you applied drizzling to the image ? Could help but not entirely solve the issue.
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Thanks Tim for the insight
I kept moving things to get my back focus correct –had issues with getting the back focus for my OAG/guide camera.
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I did not try to drizzle- its a mess - lesson learned will go back at it
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To be very honest, you could save the central portion of the image at the cost of lowering resolution quite a bit.
We all know this is a hobby that will put you to the test on many aspects such as resilience and patience. Maybe you should try to redo everything altogether (sorry!) Consider a different approach.
My first guess is that you are using an equatorial mount. If you are using an AZ mount, the field rotation is inevitable. That said, there are a few de-rotator devices out there but with very limited success. Please do get an equatorial mount.
Secondly, do not change the camera orientation between imaging sessions. Try not to touch anything as you will want to assure the same framing. Even if you are imaging with a square sensor such as the 533 chip , you will still need to get the exact same orientation on every imaging run. You will also want to keep the same setup for your flats. I assume you are using a OSC camera. If that is the case, try a filter drawer in case you really need to swap filters but I would try doing the entire project on a single filter if possible so you will not have to mess with the imaging rig in any way between runs.
Use NINA to center the object in the framing tab on every session. Platesolve and make sure you use the camera orientation assistant on the same tab (it will calculate the exact orientation of your camera by plate solving). NINA does a terrific job on this task.
I wish you luck!
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Guy thanks for the advice much appreciated
I am using EQ mount with asiair plus -I’m learning how to use that for framing,and doing my best not to move the camera from night to night imaging
What caused some of my issues was my first time using the AOG and getting the back focus with both cameras. I think I got that figured-which will prevent me from moving the camera
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Tom,
Every imager has his or her process for getting things ready for imaging. You will find yours… Keep at it. The results will come!!!!
CS Tim
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I don't know about Siril. If you use PixInsight, you can use local normalization function (or the normalize scale gradient script) when you integrate the subs. This will bring all subs to a common background brightness, and therefore can greatly suppress (or even eliminate) the frame boundaries, so you won't need to crop.
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Another suggestion is to treat each night as a mosaic panel and then assemble a mosaic. Don't worry if each night has low SNR, your final image ("mosaic") will eventually have a better SNR. Have a try!
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Tom H:
First time doing multiple nights of imaging.
I believe i did not properly frame each night.
Can you correct when processing?
I processed through Sirilic
have to crop  AT least our sensors are hip to be square  |
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Tom H:
Guy thanks for the advice much appreciated
I am using EQ mount with asiair plus -I’m learning how to use that for framing,and doing my best not to move the camera from night to night imaging
What caused some of my issues was my first time using the AOG and getting the back focus with both cameras. I think I got that figured-which will prevent me from moving the camera I do not have any meaningful experience with the ASI air but I do know it can platesolve. Hence, it should work out fine for you. Good luck!
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