A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Frank Reed
Date: 2009 Dec 13, 20:00 -0800
"I'm a bit doubtful about handheld shots on land providing sharp enough images, if they need 1/5 second. Maybe his proposal for storing a stream of many such images, in the hope that some will show little motion, will work, if the camera is capable of processing and storing those high-resolution images fast enough."
"First, we have to be aware that, if stars need a 1/5 sec exposure to show
them up, there's no hope of taking such a picture from at sea, with the
inevitable motion underfoot."
Amateur astronomers do similar sorts of things all the time (not for observer motion, but for air motion). For example, for high-resolution planetary photography, which is a highly-developed and sophisticated activity these days, the preferred tool is digital video. Then frames can be selected (and this is usually done automatically) during moments of perfect "seeing". An automated system on a boat could take images more-or-less continuously, hundreds per minute, and catch those moments that just happen to be stable. Even if you only get one good shot in five hundred, that amounts to roughly one hundred accurate and usable photos in an average night. Of course, that's a highly automated system, and maybe therefore not much fun. But none of this digital photography navigation is possible without a computer so you might as well consider complete automation.
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