M31 darks, flats and bias

[eyepod]

I think I'm beginning to understand what all the fuss is concerning flats and bias. This is my third go at M31 and this time I added flats and bias. It has certainly cleaned up the image compared to the previous one.

Top image is 20 x 2 mins ISO 800 10 darks 10 flats and 10 bias.

Bottom image is the same but no flats or bias.

Both using Nikon D5300

Thanks for looking

Jason

[MarsG76]

Hmm, definitely a improvement, maybe I should start using flats and bias frames....

[eyepod]

Yes definitely worth doing, for flats I put the scope/camera right up to my TV and found a white test screen video on YouTube. seems to work ok

Jason

[laudropb]

Very nice image showing the value of flats, darks and bias. Thanks for posting.

[Astrosurf]

Very good! I use GradientXTerminator in Photoshop instead of flats. It's excellent, and you can choose to colour balance with it too. I don't know if you can use it with the freeware GIMP though, if you don't have PS.

Alexxx