Wide Field of M31 in RGB at 255mm f/4.2

[Philippe B.]

Hello
Here is a M31 image taken with QSI-540WSG on FS60CB at 255mm f/4.2.
For chromatic issues with FS60 and reducer, I didn't use the Luminance filter but only R,V,B and Ha filters.
 
Blue : 12x15min
Green : 11x15min
Red : 11x15min
Ha: 9x15min

141 bias, 47 dark of 900s, 21 flat for each filter, 22 dark of 30s for Ha flat.

Preprocessing and Processing PIXINSIGHT
Final color adaptation : toshop
 

RGB version with Ha on red channel


Click  for 75% version

RGB version without Ha


click for 75% version

Philippe

[andyschlei]

WOW.  Stunning image.

The detail in the dark area is great as is the balance of the stars.

[Lex]

Super Image!

Really fine details, super colors and nice small Ha Emission spots!!
Absolutely flat field also!

What other Hardware did you use on this?

Congrats!!

Cheers

Lex

[zvrastil]

Hi Philippe,

I really like this image, it's beautiful. What puzzles me is why stars have nice blue color, while outer parts of the galaxy do not. I would expect the galaxy to be more colorful.

best regards, Zbynek

[Philippe B.]

Thanks to all of you

@Lex:  what do you mean by other hardware ? My mount is a Takahashi JP-Z with FS2 drive. For flat field, I use a Gerd Neumann screen.

@Zbynek : it seems M31 is not "blue" like we find evry time. Here, we are closer of a DSLR rendering. If I make a color calibration in PI, I obtain this (also by other methods). But neutral rendering was the goal of this image

cheers

[Lex]

Philippe,

Thanks, that's exactly what i meant 

And again; Great Pic!!!!

Best

Lex