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| p.4 #9 · p.4 #9 · Nightscapes using AstroTrac Tracking Mount |
Fred Miranda wrote:
I got a couple requests to show pictures of the set-up I am using:
Gitzo GT3541GL tripod,
RRS BH-55 ball head,
Astrotrac scope and
PS: Note the scope is upside down. As Steve mentioned on his article, the polar scope is susceptible to fall. Once I polar align it, I usually reverse its position. (as shown on the pictures)
Yeah Fred, I think I need to buy one of those wedges for the stability. Looks great! How does the AstroTrac do with guiding that 500mm? How long of an exposure have you taken at that focal length?
I tested the multiple exposure setting on my D800 tonight, but for some reason each image shifts to the right but a long exposure does not move. These were two minute exposures totaling four shots. It simulated star trails or made it look like the AstroTrac was not tracking. The noise was gone though....
I was testing my new Nikon 70-200mm AF-sG VRII lens on it (basically a star test) to see if there was any CA at f/4, there was none. Awesome lens. Very little coma at the corners. I'll go out again saturday night before the moon comes up to get more Orion shots....