M42 and NGC 1973-5-7 Nebula with 5-inch AP apo refractor at f/6 and Hutech-modified Canon 5D camera. Stack of 4 x 14 minute exposures at ISO 400 + 3 x 2 minute exposures for core at ISO 400.
Orion Nebula region with NGC1973-7. Stack of two 10-minute exposures + stack of 30s and 1min exposure for retaining bright core deail. Blended with Normal @ 85% but erasing all of short exposure layer except for core. With Canon 20Da, at f/6 with 5-inch AP apo refractor, ISO400, and Long Exposure Nosie Reduction ON in camera. Ambient temp was about -3° C. Taken Dec. 29, 2005.
M42 amd M43, Orion Nebula, with 92mm TMB Apo refractor and Borg 0.85x flattener/reducer for f/4.7, with Canon 20Da camera at ISO400 for stack of 4x 12 minutes, 4x4 minutes, 4x80 seconds and 4x20 seconds (for core). Bright area in upper layer selected, feathered, inverted selection, copied, the lower layer selected and Mask created, making a dark hole in the shape of the bright area for shorter exposure content to shine through.
