This is just a test. System is just about aligned, one more tweak?
Flexure now is less than one pixel per hour. Cumulatively it is less than three pixels over seven hours as the flexure reverses through the meridian.
13x32 minutes in 3nm NII or about seven hours.
Full resolution image here 5MB
http://d1355990.i49.quadrahosting.co.../6164&6188.jpg
Bert
Astrograph is an Officina Stellare RH200 which has a focal length of 600mm and is 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.