Seeing this is a show and tell.
http://www.iceinspace.com.au/forum/a...4&d=1176622217 (tidied it up since then and no white showing)
http://www.iceinspace.com.au/forum/a...5&d=1176622217 A shot from the front just for the hell of it
Yes I know it is very yellow but
http://www.iceinspace.com.au/forum/a...7&d=1176622481
for the SBIG depending on what colour I want depends on how long I make the exposure. The colour doesn't seem to matter with the DSLR as it is converted to 16bit grey scale in IP for flat fielding anyway.
http://www.iceinspace.com.au/forum/a...5&d=1176643216
The result from sitting on my 8" SCT
I measured the output across the face of the lightbox and there is less than 0.2 lux difference between the center and any other spot around the screen.
http://www.iceinspace.com.au/forum/a...9&d=1176643216
The final result.