Thank you all for the kind words
Mike, Phil and Greg - has been an interesting read. I was not aware that the 16803 sensor was so large! The Vixen does look interesting - and fast!
amyth91 - this area would come up ok with a unmodded 6D. Since a normal 6D transmits only about 25% of the red light of the hydrogen alpha emission band, the red nebulae won't come up as much. The Astronomic UHC will give you quite a strong green colour cast, so it would recommend shooting this without the filter. The blue horse head, the river to Rho Ophiuchi and many other goodies would come up nicely with the 6D
Photoshop was used to shrink stars.
The total exposure time is difficult to establish because it is a multi-panel mosaic, but I have included the panel shot details in the description. Some areas were covered more than once. Rho Ophiuchi was covered and stacked 4 times.
