bistdunarrisch

@bistdunarrisch@lemmy.world

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bistdunarrisch OP ,

Very special diffraction lens used…

bistdunarrisch OP ,

Yes, I used Siril for stacking/ stretching, Starnett++ for star removal (to edit the glimpse of orion nebula a little better), GraXpert for gradient and noise, and BlurXTerminator for deconvolution.
Final editing was done in Photoshop.

So heavy editing indeed..

bistdunarrisch OP ,

Ha thanks, didn’t expect such nice comments for such a bad image.
Yes I also was blown away that the nebula is barely noticeable, even with smartphones strong IR filters

bistdunarrisch OP ,

I mean, I literally just put the phone on the roof of my car and leaned it against my wallet.
It was just an experiment because I wanted to know whats possible with just a phone

bistdunarrisch OP ,

While there are tools like generative AI models to invent images like this, in astrophotography it is very important only to use tools which don‘t invent any new information.

The only tool which is debatable is denoising with AI, as it really creates information learned from other images. But even here there are ways to prevent this.

Imo at the end we want to capture whats really out there, not what there could be

bistdunarrisch OP ,

Yes processing the image plays a huge role.

But at the end you can only work with the information provided by your equipment as there are physical limitations on what one can capture.

To me the most interesting part of this hobby is to learn what you physically really have to do to get good images. Physics not only plays a role on understanding what we see in these images but also on how to make them.

Truly fascinating!

bistdunarrisch OP ,

Thanks!

bistdunarrisch OP ,

Thanks! No the wood isn’t treated in any way

bistdunarrisch OP ,

Thanks! There is one anker point at the top with an dowel in the wall.
The rest is fairly stable as one piece

bistdunarrisch OP ,

Thanks, yes there is a very thin sheet of plywood attached at the bottom of each disk. The disks themselves where completely dried before of course

bistdunarrisch OP ,

Yes that's true, and I think at least in this case the imperfections are acceptable because the desired look was to feature the organic look of the wood. At least it's a good excuse for the lack of woodworking skills

bistdunarrisch OP ,

The surface is very rough as we don't have the right tools to achieve a smooth finish. As it is very rustic we just leave it as

bistdunarrisch OP ,

Ahh, thanks!

bistdunarrisch OP ,

Thanks :)

bistdunarrisch ,

Beautiful!

bistdunarrisch OP ,

Thank you!

bistdunarrisch OP ,

Thanks!

bistdunarrisch OP ,

No not really, but I choose it because I didn't know what the precision of the tracker was as I never used one before.
But as I know now with only 135mm focal length I can use well above one minute.

Using a longer exposure time is normally preferred because you don't get so much images to process. But as always there are exceptions (lucky imaging, comet shooting, more precise work needed -> polar alignment)

bistdunarrisch ,

Wow this looks amazing.
If you don‘t mind I have some questions..
I assume this was shot with an Ha filter to reveal the structure on the surface, otherwise it would be all white?
Also what is the need of 10% of the images? Do you stack them? One exposure should have enough signal shouldn’t it?
And last but not least what focal length does your telescope have?

bistdunarrisch ,

Thank you very much for responding!

bistdunarrisch OP ,

Well thank you very much!
I‘m still a beginner myself, for our first tries the videos from Nebula Photos on youtube helped a lot, especially the workflow in Siril.
This is only our second serious attempt, so I don’t know if my help is of any value, but I‘ll try anyway.

Yes we used a heater for the lens, the complete setup was covered in ice, so this helped a lot.

https://lemmy.world/pictrs/image/fd0be910-e217-4294-844d-580c9f03b24c.jpeg

Yes I did make calibration frames but didn’t use them as I got problems with the result.
I forgot that I shot with the dual narrowband filter and used an lcd for flats..
But GraXpert handled the very strong gradiant quite well.

What I think helped the most in terms of quality and artifacts was the constant use of dithering.
As the star adventurer 2i obviously can only dither in one axis we dithered manually on the other every 10-15 mins.
Hope this helped!

bistdunarrisch OP ,

Absolutely!

bistdunarrisch OP ,

This was shot from a Bortle 5 zone. Also this was shot near a city so the gradiant was quite strong

bistdunarrisch OP ,

Thanks!

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