posted on Jan, 14 2009 @ 01:51 PM
you can make a pseudoscope yourself with lenses etc you may already have lying around.
the power of the scope is determined by the ratio of the focal length of the main lens to the focal length (fl) of the eye lens.
so, for example, with a 500 mm fl front lens and a 50 mm fl eye lens,
you have a 500/50 ratio, or 10/1, thus a 10x power scope.
shorter fl eye lenses, say 25, 10, 5, etc would give powers of
20x, 50x, 100x respectively with that same 500 mm fl front lens.
more light gathering, for dimmer space objects, is determined mainly by the diameter of the front lens.
sky and telescope
all have information and sources for parts.