Orion - First multi...
 
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Orion - First multi-session project // Need your opinion please  

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(@skanker)
Red Giant Customer
Joined: 3 years ago
Posts: 76
February 18, 2021 20:19  

Hello from Austria!

 

I am currently working on a complex project and need your opinion. I photographed the constellation Orion during three nights.

Equipment: Canon 6Da + Sigma 105mm A + Optolong L-Pro

Lights: 75sec. /f2.5 / ISO 800

 

I stacked the three sessions with the standard parameters (+ MBB 5% + LNC degree 1 (1iteration)).

I dithered the pictures. Does something have to be checked in APP if the images are dithered?

I have uploaded the result to you in various stages!

Orion rawstack
Orion starless

 

Can anything be improved here or is the result ok? Are the used settings ok for a "three session project" like this?

 

CS

 

Gernot


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(@vincent-mod)
Universe Admin
Joined: 4 years ago
Posts: 3861
February 19, 2021 19:11  

No, dithering is just about moving the telescope tiny fractions between each frame. APP will align those of course and this is where dithering helps as it makes bad pixels and fixed noise patterns move around so APP can filter those more easily. Other effects an also be dealt with like this, so I always tend to dither with pretty big steps, like 5-10 pixels. No extra setting is required for this and your result looks really good I'd say.


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(@skanker)
Red Giant Customer
Joined: 3 years ago
Posts: 76
February 20, 2021 08:43  

@vincent-mod

Thx for the info Vincent!

I dithered every third image for 10 pixels.

Is LNC degree 1 (1it) ok for a three session project or is this depending on the gradients in the subs?

CS

Gernot


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(@vincent-mod)
Universe Admin
Joined: 4 years ago
Posts: 3861
February 20, 2021 11:35  

That's a good dither schedule yes, if you have enough images. For small datasets (like 15 images) I would do it every frame.

The LNC is dependent on the overall background illumination per image, trying to get those more equal. This won't remove gradients though. And if it's fine with 1 iteration, then that's good. You can always end up with light pollution gradients, that's something you have to deal with using the light pollution tool.


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(@skanker)
Red Giant Customer
Joined: 3 years ago
Posts: 76
February 28, 2021 08:40  

@vincent-mod

Thx for the info Vincent 🙂

CS Gernot


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