A 2-layer stack (Mean Combine) of 12 min exposures at ISO 400 with Canon 20Da, with TMB 92mm at f/4.6 with Borg flattener. Shot on same night with 5DMkII as well for comparison pair.
NGC 6888 in Cygnus and area, taken with TMB92mm apo refractor with Borg .85 Reducer/Flattener for f/4.6. Taken Sept 29/30, with Canon 20Da, for stack of 3 x 10 minute exposures at ISO 400.
NGC 6888, the Crescent Nebula in Cygnus, a bubble of gas blown from a superhot “Wolf-Rayet” star at the end of its normal life. Above, is a general field of emission nebulosity associated with the star Gamma Cygni in central Cygnus. This is a stack of 5 x 8-minute exposures with the Quattro 20cm astrographic Newtonian reflector at f/4 with its coma corrector. The camera was the filter-modified Canon 5D MkII at ISO 800. Shot from home Oct 13, 2015, using the Mach 1 mount and SG-4 Autoguider.
