My God it's full of stars.
Here's a nice test of the field flatness of the GSO RC.
Tucana 47 in LRGB. (30, 20, 20, 20 Minutes)
8" GSO RC, SBIG ST-10XME etc.
I'm really happy with the result. Will have to check the colour balance again when I'm not so tired.
Much larger image available
here
Cheers
Stuart