Bushnell 3" REFLECTOR Telescope User Manual


 
4
Enjoying Your New Telescope
1. First determine your targeted object. Any bright object in the night sky is a good starting point. One of the favorite starting
points in astronomy is the moon. This is an object sure to please any budding astronomer or experienced veteran. When
you have developed proficiency at this level, other objects become good targets. Saturn, Mars, Jupiter, and Venus are good
second steps to take.
2. The first thing you need to do after assembling the telescope as planned is center the desired object in the finderscope.
Provided you did a reasonable job aligning the finderscope, a quick look through the main telescope tube at low power
should reveal the same image. With the lowest power eyepiece (the one with the largest number printed on it) you should
be able to focus the same image that you saw through the finderscope. Avoid the temptation to move directly to the high
-
est power. The low power eyepiece will give you a wider field of view, and brighter image--thus making it very easy to find
your target object. At this point with a focused image in both scopes, you’ve passed the first obstacle. If you don’t see an
image after attempting to focus it in, you might consider aligning your finderscope again. Once you pass this step, you’ll will
enjoy the time spent ensuring a good alignment. Every object you center in the finderscope will be easily found in the main
telescope tube, which is important for continuing your exploration of the night sky.
3. The low power eyepieces are perfect for viewing the full moon, planets, star clusters, nebulae, and even constellations.
These should build your foundation. However, for more detail, try bumping up in magnification to higher power eyepieces
on some of these objects. During calm and crisp nights, the light/dark separation line on the moon (called the “Terminator”)
is marvelous at high power. You can see mountains, ridges and craters jump out at you due to the highlights. Similarly,
you can move up to higher magnifications on the planets and nebulae. Star clusters and stars are best viewed through the
low power no matter what.
4. The recurring astronomical theater we call the night sky is an ever-changing billboard. In other words, not the same
movie plays all the time. Rather, the positions of the stars change not only hourly as they seem to rise and set, but also
throughout the year. As the earth orbits the sun our perspective on the stars changes on a yearly cycle about that orbit. The
reason the sky seems to move daily just as the sun and the moon “move” across our sky, is that the earth is rotating about
its axis. As a result you may notice that after a few minutes or a few seconds depending on what power you are viewing
at, the objects in your telescope will move. At higher magnifications especially, you will notice that the moon or Jupiter will
“race” right out of the field of view. To compensate, just move the fine adjustment controls on your telescope to “track” it in
the necessary path.
Helpful Hints
1. Your telescope is a very sensitive instrument. For best results and fewer vibrations set your telescope up on a level loca-
tion on the ground rather than your concrete driveway or your wooden deck. This will provide a more stable foundation for
viewing, especially if you’ve drawn a crowd with your new telescope.
2. If possible view from a location that has relatively few lights. This will allow you to see much fainter objects. You’d be
surprised how much more you’ll see from your local lake or park when compared to a backyard in the city.
3. Using your telescope out a window is NEVER recommended.
4. View objects that are high in the sky if possible. Waiting until the object rises well above the horizon will provide a
brighter and crisper image. Objects on the horizon are viewed through several layers of earth’s atmosphere. Ever wonder
why the moon appears orange as it sets on the horizon. It’s because you are looking through a considerable more amount
of atmosphere than you would directly overhead. (Note: If objects high in the sky are distorted or wavy, you are probably
viewing on a very humid night.) During nights of unstable atmosphere, viewing through a telescope can be frustrating if not
impossible. Astronomers refer to crisp, clear nights as nights of “good seeing.”