Click on image for large version
Subject
NGC 7331
Date
18th October 2003
Telescope or Lens
Celestron 9.25 SCT with Celestron f6.3 focal reducer spaced for f5.75
Mount
G11
Camera
SXV H9
Filters
TT LRGB and NIR blocker
Total Exposures L 120 min R 40 min G 40 min B 40 min
Sub exposure
Stack of various exposures ranging from 30 seconds to 20 min
2 x 20 min
2 x 20 min
2 x 20 min
Binning
Luminance 1x1 RGB 2x2
Field of view and resolution
Approx 19.5 x 14.8 Arcminute. 0.98Arcsec / Pixel
Comments  
This is my first succesful image with the 9.25 on the G11. Guiding was through the Celestron 80mm f5 refractor with a 3 x teleconverter to give a focal length of 1200mm. Guiding was using the ST4. The range of exposure represent the fine tuning of the guiding and balance. As each was improve I was able to increase the exposure length. There is still some trailing due to guiding errors but I am reasonably pleased with the results. Other galaxies in the field include NGC 7335, 7337, 7340.