| Bring on the night! From the moon, with its appearance
changing nightly, to the cosmic dance of the planets, to the delicate
views of nebulae and galaxies at their incredible distances, this
is why many of us love astronomy.
Your hobby of astronomy will be made fun and long-lasting if you
obtain the right telescope for your observing needs. At Scope City
out expert sales staff will find the right scope for you whether
you want binoculars for panoramic view of the sky, or an entry-level
scope to get you or your children started on the wonders of astronomy,
or a sophisticated computerized large aperture scope for an observatory
at your school or the one in your own backyard. Scope City has a
large selection of almost any accessory needed for astronomy.
Lunar and Planetary Targets 
Any well-made telescope will give you fine views of the moon and
planets. Planets are best viewed at a magnifications 40 power per
inch of telescope aperture. A planetary or neutral density or polarizing
filter will often enhance planetary views.
Deep-Sky Targets 
You will find that high magnification is not always desirable when
observing deep sky objects. To gather light the most important attribute
of the optical system is the aperture of the main lens. The measure
of light transmission through a telescope is called "light grasp".
Light grasp is a function of the area a telescope objective, it
increases as the square of the diameter of the aperture goes up.
For example an 8 inch telescope has four times the light grasp of
a 4 inch telescope - It is four times brighter.
for a table that compares scope apertures, listed both in inches
and millimeters, with the associated Light Grasp, Magnification
limits and Limiting Visual Star Magnitudes.
The other parameter that affects brightness is magnification. Double
the power, your image ¼ the brightness. This is good because many
deep-sky targets are actually quite large Thus low-power, wide-field
eyepieces can allow you to see large, dim targets and view large,
panoramic views of the sky. |
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