| http://www.w3.org/ns/prov#value | - ive even for relatively short exposures.Other things to watch out for are precise focusing, use a tripod and cable-release, and mirror lock up if you have it. ???Precise focusing is more difficult than it sounds and is a particular problem with longer focal length lenses or when shooting through a telescope.What type of equipment are you using? ???You will find that it is very difficult to obtain
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