I could not resist taking 5X32 minute frames of the Horse Head region as a test.
Full sensor resolution FoV 3.5 X 3.5 degrees. 6MB
http://d1355990.i49.quadrahosting.co.../HH_NII_DL.jpg
All the work to accurately align and get rid of residual flexure has been worth all the pain.
Bert
Astrograph is an Officina Stellare RH200 which has a focal length of 600mm and is F3, yes F3! Clear aperture is 200mm.
FLI Atlas Focuser.
FLI ten position filter wheel CFW-3-10 with 50mm square filters.
Astrodon E series LRGB and HA, NII, SII and OIII 3nm NB filters. Also a continuum filter 5nm.
Camera is a FLI PL16803 which has a sensor size 36.8 X 36.8 mm.
The FoV of this system is 3.5 X 3.5 degrees.
Mount is a Software Bisque PMX.