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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Photo sextant sights
From: Bill B
Date: 2008 Aug 03, 18:45 -0400
From: Bill B
Date: 2008 Aug 03, 18:45 -0400
> George Huxtable asked > >> It seems inherently unlikely that the resolution was anything like that. 15 >> pixels per minute would require about 450 pixels across the Moon, and nearly >> 3000 pixels across the gap between Moon and Jupiter, which is only part of a >> screenwidth (and it's not clear where the screen width limits are). Would >> that ever be possible, even with the highest-qualitydigital camera? George Just looked up the specs of the camera used, a Nikon D70. Its sensor matrix is advertised as 3008 x 2000 pixels. The Canon EOS-1Ds Mark III has an impressive 21.2 megapixels, with a 5616 x 3744 pixel sensor. The above are 35mm-style single-lens reflexes. You did say "highest-quality digital camera" but one is not likely to find anything larger than the above on a sport boat unless in the hands of a professional. Once you get into the larger (old 6 cm x 6cm) hand-held body style (like Hasselblad) the pixel numbers go up. For view cameras (like Sinar Bron) the pixel count jumps again. Bill B. --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
