msalvetti Offline Upload & Sell: On
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I think it all comes down to how many seconds of exposure you need to capture enough stars. Because the Gigapan isn't an equatorial head (which you wouldn't want anyway, since the foreground would "move"), you'll probably be limited to no more than 10-20 seconds, depending on how large you want to print.
I found a post on DPReview by Royce Bair (http://intothenightphoto.blogspot.com/). I think his work is probably similar to what you are looking to achieve (although I didn't see anything stitched):
"...I keep my 8mm - 16mm lens shots under 30 seconds, my 17mm to 28mm shots under 16 seconds, and my 35mm to 50mm shots under 10 seconds."
"Some astro-photographers use the "600 rule" for determining the length of their exposure time: dividing 600 by the focal length of the lens (using a full-frame 35mm equivalent). I adjust this to my own "450 rule", which produces less blurring on larger prints. Thus, the maximum exposure time for a 28mm lens would be 16 seconds (450 / 28 = 16)."
It will be interesting to see how well the stitching works. I guess it will depend on now long it takes you to complete the pano, since the stars will be moving throughout.
Mark
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