Arp 245 reprocessed.

[sjastro]

As pointed out by Jase, the colour balance was a bit of a mess caused by a compressed histogram in the green channel. Here is a complete redo.

http://users.westconnect.com.au/~sjastro/arp245c.html

Regards

Steven
http://users.westconnect.com.au/~sjastro/small

[jase (Jason)]

A much improved rendition Steven. Well done. The data still looks clipped though. Is this intentional to circumvent the uneven field illumination? Are you applying (dividing) flats?

Cheers

[sjastro]

Originally Posted by jase

A much improved rendition Steven. Well done. The data still looks clipped though. Is this intentional to circumvent the uneven field illumination? Are you applying (dividing) flats?

Cheers

Hello Jase.

I take flats using a luminous painted light source which slips inside the dust cover.
http://users.westconnect.com.au/~sjastro/flatglow.html

I never have a problem with uneven illumination.

Unfortunately flats are completely useless when the CCD window frosts over as occurred in this case. I was forced to clip the histogram.

Regards

Steven