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Hi IC1101, Every state has different rules regarding the max. power,
and who can own them. Regarding astronomical use, I think all states
require you to be a member of an astronomical club or society. Some
states require formal permission to own one, others don't. The rules
are in the process of being tightened in some states, due to the number
of incidents involving aircraft.
Regarding eyepieces, firstly, the mm figure [4mm, 10mm, 36mm, etc]
is the focal length of the eyepiece; the lower the number, the higher
the magnification it will give with any given scope. The mag. is the
result of dividing the focal length of the scope by the focal length of
the eyepiece. 1000mm focal length scope divided by 10mm
eyepiece =100x mag. 1200mm scope with 4mm eyepiece =300x mag.
The degrees figure is the field of view the eyepiece gives. Certain
eyepieces suit certain types of scopes better than others. Eyepiece field
of view varies from about 40degrees to an extreme 100 degrees.
The type and focal length of the eyepieces you choose will depend
on what scope you have, what you like to view most, and how deep
your pockets are.
raymo
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