M45, The Pleiades in Taurus

 

 

 

Exposure Data: 10/5,6,11/2002.  2 x L(B)RGB: 12x5m, 4x5m, 4x5m, 4x7m,  All 1x1.
-15C, 3.5 arc-sec./pixel.
 
Processing: Acquired via script with Maxim, reduced, Debloomer, hot/cold pixel processing in Maxim, aligned, combined then minimum combine in Mira, RGB combine in Maxim.  LRGB, curves, levels, etc. in Photoshop.
 
Optical System: FSQ-106 @ F/5, ST-8E USB NABG/CFW-8A CCD camera, guided by eFinder/STV, Paramount ME mount.
 
Comments: Two complete sets of exposures were taken with the camera rotated 90 between sets.  FocusMax was used to refocus the camera automatically after a filter change as part of the script.  16 darks, 32 bias and 7 flats were taken.  After frame normalization, each color sum was aligned and minimum combined.  This eliminated all vertical star diffraction artifacts but left the reflection of the CCD chip that to come off the chip cover glass.  See this link for a typical un-rotated image.