DMihai

I think you forgot that in your calculations you used the sensor's diagonal not width or height. As you can see from your link the sensor's diagonal matches with the moon's diameter...

Hello, I am very new to this hobby but here is my take: You are comparing the sensor's diagonal with the moon's diameter. In this case, yes, the ratio will be close to 1:2. However you will not capture anywhere near half of the moon's surface. For a more graphical representation you can use this calculator: https://astronomy.tools/calculators/field_of_view/ Switch it to imaging mode, select your telescope, camera and the moon as your target and click "add to view". Hope this helps, Mihai

Thank you for taking the time to explain it to me in such detail! (And for the tips as well!) Everything was disassembled at the end of the first session so the chances are that things were screwed back together differently. I will do my best to correct any issues and hopefully it won't turn into an obsession and I will enjoy being under the stars. Thanks again everyone, I wish you all the best! Mihai

Hi Carole, Thank you! Indeed, the images were taken during 2 consecutive nights and have different orientation. However the elongation I'm talking about can be seen in the individual light frames and are less obvious in the final integration. Looking into optical aberrations it seems that some of the stars' shapes are similar to those affected by astigmatism. Could that be the issue and not the spacing/tilt? Or could that be just another symptom of the spacing/tilt issue?

Hello Vlaiv, glad to be here! All the connections were threaded and I didn't notice any play in the focuser, though I did not specifically test for that. Perhaps the adapter does not sit flush with the flattener or the camera and it introduces tilt. I am not convinced that it is tilt though. If you have the time, can you take a look at the 2 light frames please? There is one light frame from each of the 2 sessions (2 nights). As to the "true" colour, I agree with you. All I wanted to point out is that after the colour calibration the galaxy seemed "ok" but the stars less so.

Thank you! Yes, I color calibrated the stacked image, and the galaxy's colour seems close to "natural". That is, close to what others with much more experience are creating... It seems to me that these are the colours the camera captured but there is something strange about it and I'm curious.

Hello everyone! I would like your advice regarding a few issues I'm having with an image I took a few days ago. This is my first DSO image and while I'm happy with it, I'm sure there are a lot of things that can be improved. The issues my inexperienced eyes can detect are: The stars away from the center of the image are elongated, but they are not all pointing away or towards the center (which I understand would imply a wrong flattener – camera distance). This can be seen in the 2 light frames shared. The vast majority of the stars are yellow. Could this be a processing issue? (I know there are a lot more yellow/white stars than blue, but still…). I was imaging at about 46 deg N and the target was between 60 and 80 deg Alt so I don't think the atmosphere was the reason. You can find a light frame from each session, unprocessed stack and the final effort (jpg) here: https://drive.google...f9v?usp=sharing If needed, you can find the details regarding equipment/technique as an attachment so that I can keep the length of this post reasonable. If there’s anything else that I forgot to add, please let me know. Any feedback from you is greatly appreciated! Thank you! Cheers, Mihai Equipment-techique.txt