8-minute exposures at f/4.5 with AP Traveler apo refractor. 20Da camera at ISO800, on warm summer night. In camera LENR On. Taken Aug 4, 2005. Stack of two for noise reduction, both layers also Noise Ninja filtered. Colors not enhanced except through contrast boost.
Veil NGC 6992-5 with 101mm Borg apo refractor at f/4.1 and Canon 20Da camera at ISO800 for stack of 3 x 6 minute exposures. Taken with HEQ5 mount and auotguided with ST402.
North American Nebula (NGC 7000) and environs in Cygnus. Pentax 6x7 camera on Vixen 108DD doublet ED astrographic scope, at f/5, 540mm focal length. Ektachrome E200 slide film with 50 minute exposure, taken July 28, 2003. Autoguided on AP600 mount. Object near zenith under good but not super clear skies. Scanned on Nikon 8000ED scanner with 8x sampling and Super Fine mode. Image is a single exposure not a stack of multiple exposures. Slight gaussian blur (2.5 pixels) applied to Red channel to smooth background of nebulosity without blurring stars. Also, Blue channel scaled up 100.2% and Red channel scaled down 99.9% to largely eliminate lateral color which spread stars out at corners. It worked very well -- only slight coma remains in Blue and hardly visible in RGB full color.
