8-minute exposures at f/4.5 with AP Traveler apo refractor. 20Da camera (second night out with it) at ISO800, on warm summer night. In camera LENR On. Taken Aug 1, 2005. Two image stack with top layer at Normal 50% for noise reduction. Noise Ninja filtering also applied. Notice the sky color difference on either side of the main arc -- it is expanding into an area of sky wiht more interstellar dust, so the sky and stars to the right of the arc look yellower, reddened by dust. The sky to the left looks more neutral.
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.
