Gonzo

NGC 7635 41x300s Redcat51,CEM25p, 533MC (U/V filter).

I have reprocessed the data, using better flats and a better use of the starnet.

It was the OAG stick...

with the stick backed out:

with the stick where it should be (in this test, I did not align the prism with the main camera sensor)

yeah, at least it's not an issue with the camera. Just me doing something wrong.

Well it turns out to be the flats...

Siril autostretch of a single frame, I cannot see this issue.

This is a Siril stack of 41x300sec and I get this on the side, it looks like amp glow but the 533MC does not have amp glow.

The camera/scope/mount was in a dark place with no direct light or ambient anywhere near it, it's always on the right side of my images. This time it's really present.

Not sure if I'm doing something wrong with my Siril processing.

I did take a screenshot of the starless mask for another post, ignore the red rectangle, this is the stretching I got before something went wrong.

Redcat51, 533MC (u/v filter only), CEM25p, Siril processed (using 1.2.0). Messed up something at the Star recomposition stage and lost my previous stretching (it was nicer than this).

41x300s (+darks+biases+flats), bortle 4 location

If you zoom in, you can see the bubble 😁

It should be for the next 3 nights, I'll add more data to it.

Before I took M45 I was on M31 for about 4 hours but something went wrong with the mount so I switched over to M45 and only got 50 min, I was getting tired and needed to go to bed.

29 minutes ago, tooth_dr said:

Crappy is subjective!  I think it’s excellent and thanks for sharing. 

I feel that I could have pulled more of the dust clouds for 300 seconds frames, I would also like to know how to get the actual background more dark.

The image feels a bit washed to me.

M45, RedCat51 + 533MC + CEM25p[unguided]... and a very crappy process with Siril. 10x300sec lights + 25 of darks/bias/flats

Cool thanks for the tips, I'll try the "green noise removal".

@ONIKKINEN

This is what I came up with, using the Asinh transformation tool and following your "Start processing with a crop, a background extraction, colour calibration and a stretch (in that order)"

It really does look way better now (I think) than the one I've posted at the start of this thread.

Thanks for the detailed response, I shall try the Asinh transformation tool.

Overall I'm quite happy with the capture, but I do need to get my main computer sorted out to be able to work with Pixinsight and on a large monitor instead of the laptop...

Stacked with ASTAP (just lights and dakrs, with software settings left as they are) and just an auto-stretch in Siril

9 minutes ago, WolfieGlos said:

Yeah, I followed that topic briefly and got completely lost and confused. Way above my head!

There is an old discussion on Siril's forums here: https://discuss.pixls.us/t/m31-andromeda-why-is-siril-making-it-appear-mauve-brown/20934 - that result is exactly what I got for M31, the conclusion seemed to be to try stacking with ASTAP, so that is what made me try it and it worked. I find that ASTAP isn't quite as good at removing satellite trails, usually the very bright ones get some artifacts left in, but nothing that clone stamping can't resolve.

I posted about it when I imaged M63 earlier in the year with a comparison here: https://stargazerslounge.com/topic/409905-m63-sunflower-galaxy/#comment-4381252 - and found exactly the same. It might be in white balance, colour balance or even possibly how Siril converts the files, I don't know. I just know that ASTAP gives a more colourful result.

I now stack all galaxies and clusters with ASTAP - I've found globular clusters to have the same net result of colour loss in Siril. Nebulae I still use Siril but I haven't tried one with ASTAP yet to compare, but I intend to when I get some more imaging time.

The other option is to use Pixinsight or APP, but I don't own the software to try.

Thanks for the info and links. I shall try this ASTAP thing and see how it goes.

28 minutes ago, Phillyo said:

Unfortunately I've never used Siril so I can't help much there. I use Pixinsight for everything. Seems strange you're getting no colour in your image though as there's obviously a lot of data in each channel.

I do have Pixinsight, but it's on my main computer and not on my laptop. I use Siril on the laptop. The main computer is still in a box as I've just moved country and still have lots to unpack...

22 pages of it... https://www.cloudynights.com/topic/841663-lost-color-in-siril-calibration/

These are the red/blue/green/RGB channels from Siril, maybe I'm doing something wrong somewhere.

I used Deep Sky Stacker many many years ago, however I'm on a Mac and I don't think there is a version for it. I do not have Photoshop, but I have Gimp as it's free.

8 hours ago, Phillyo said:

Lots of lovely dusty detail there, but there doesn't seem to be any colour in the image? Was this shot with the OSC version or mono version?

I only have the  colour version of the 533.

Thanks.

The core is too bright I think, I need to find some blogs on how to deal with that.

Redcat 51 + 533MC pro (IR cut filter only), processed in Siril 1.2.0RC1 (with starnet++), bortle 4 (in Germany), CEM25p

60x120sec lights + 25 darks + 50 bias and no flat, unguided

The above works really well, as long as you trust your parking skills 😆