Yet another M31  

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(@benolry)
Molecular Cloud Customer
Joined: 11 months ago
Posts: 5
October 21, 2018 23:13  

Hi,

 

although working with unsupported filetypes is a pain, I got pretty good results by converting to tiff with dcraw (following options : dcraw -q 3 -4 -t 0 -T ). This is 3 hours of integration time in 120 sec subs with 25 darks and 30 flats. 

 

m31rework Edit 2

 

Camera: Sony A7rII 

OTA: Canon 300/2.8 L USM (1st gen without IS) and Canon 2x TC III adapted with Metabones IV

Mount: Skywatcher Star Adventurer guided with Lacerta MGen II and an Orion Mini Guide Scope

Site: Bortle ~3

Seeing: initially good but decreasing in the last hour

 

Calibration of darks and flats with Sigma clipping 3 and 1 iteration

Integration with Sigma clipping 3 and 3 iterations, equal weights

The lens has some ca when paired with the 2x tc and so I first had to remove this defect in LR before running star color correction but even with that done the colors needed a lot of tweaking. I am already collecting HA data in order to bring out the star forming pockets.

A higher resolution version of the image can be found here : google drive link

 

Thanks for watching and reading. CS 

 

Ben


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(@vincent-mod)
Neutron Star Moderator
Joined: 2 years ago
Posts: 244
October 24, 2018 21:37  

Yes I think that is a really nice result actually, would be interesting to compare it to processing directly from the raw files when APP supports it! Thanks for sharing!


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(@benolry)
Molecular Cloud Customer
Joined: 11 months ago
Posts: 5
November 28, 2018 20:32  

Finished around 3 hours of ha with a manually debayered Canon 40D and an Nikon 400/3.5 Ai-s lens. The difference is subtle but worth the work.

m31ha 2

CS,

Ben


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(@leuthold)
Molecular Cloud Customer
Joined: 11 months ago
Posts: 3
November 29, 2018 01:13  

Bottom right has a bit of a red cast but other than that, it's a nice image.

Mike


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