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Subject
M45
Date
12th January 2005
Telescope or Lens
Takahashi FS60C
Mount
G11
Camera
ST2000XM
Filters
TT LRGB and Hutech LPR
Total Exposures L 56 min R 40 min G 30 min B 30 min
Sub exposure
23 x 2 min
20 x 2 min
15 x 2 min
15 x 2 min
Binning
Luminance 1x1without reducer, RGB 1x1 with focal reducer
Field of view and resolution
Approx 114 x 86 Arcminute. 4.3 Arcsec / Pixel
Comments  
The luminance for this image was taken through the Tak FS60C at its native focal length of 354mm. The colour data was gathered using an AP focal reducer, giving a focal length of 252mm and an f ratio of 4.2. This allowed better resolution in the luminance, and shorter exposures for the colour. the faster f ratio for the colour also allowed the shorter exposures to be taken at full CCD resolution rather than binning. The images were then aligned to the luminance data using Registar.