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Lynbrook Public Library
56 Eldert Street
Lynbrook, NY 11563
516-599-8630
Orion StarBlast 4.5" Telescope
INSTRUCTION MANUAL
June 2015
WARNING: Never look directly at the Sun through this telescope or its finder scope — even for
an instant — as permanent eye damage could result. Do not point the telescope at the Sun, as
parts will melt! Children should use this telescope only with adult supervision.
NEVER POINT THIS TELESCOPE AT THE SUN!
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Telescope Parts
1) Eyepiece (Zoom 8 to 24 mm)
2) EZ Finder (replaced with finder scope)
3) Telescope Tube
4) Focuser
5) Tube Clamp
6) Altitude Clamp
7) Mirror Assembly
8) Support
9) Handle
10) Eyepiece Rack (removed)
11) Extra Eyepiece (removed)
12) Rubber Feet
13) Focus Wheels
14) Eyepiece securing screws (replaced)
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The Telescope
This is a reflector telescope which has a primary mirror (4.5 inches wide) at the bottom of the tube that reflects and bends the light
coming into the tube to a point near the top of the tube where it bounces off a secondary mirror and directs it to the eyepiece where an
image is formed and magnified. The eyepiece is a Zoom eyepiece which enables you to change the setting from 8mm to 24mm
thereby increasing the magnification and decreasing the field of view.
Although we have tried to make the telescope simple to use and care for, it is still a very delicate instrument. Please handle it gently
and in will serve library users for years to come.
Transporting the Telescope
The easiest way to carry the scope is to place your forearm under the telescope tube when it is in a level position, and lift, holding the
upright support against your side. When in a car, simply place the scope on a seat and use a seatbelt to secure it. The lap belt goes
across the base, and the chest belt should cross the tube. When not in use, please keep the telescope in the padded container.
Care and Maintenance of the Telescope
Regarding cleaning the lenses or mirrors: Don’t. Let the Librarian know if they seem dirty. Eyepieces can get dirty fairly quickly,
particularly when poked with fingers. Please don’t poke them as it’s very easy to scratch the coatings.
Aligning the Mirrors: Again, please don’t. If it seems that the telescope is in need of adjustment, please tell the Librarian.
Fog on the mirrors and eyepieces: One of the odd things that happens when stargazing is that dew forms on pretty much everything
(and everyone). The primary mirror is tucked safely down at the bottom of the telescope, and so it does not get much dew on it.
Eyepieces, however, often have dew form on them, making them useless until they warm up and dry out. If the eyepiece fogs up,
wrap your hands around it for a few moments. As it warms up, the fog should disappear. Please don’t wipe the lens with a tissue or
cloth as it has special coatings on it that could be damaged if you do. Please ask people to not touch the lens… ever.
The eyepiece chart on the telescope shows what magnification you will have for each setting of the Zoom eyepiece. The “True Field”
describes the width of the image in the eyepiece. A full Moon is 30 minutes of a degree (or ½ of a degree) wide, so you could fit
about 4 full Moons in the field of view when using the 8mm setting. Change the Zoom setting until your target fits the eyepiece the
way you like. You will have to tweak the focus.
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Modifications: We have tried to make this telescope very easy to use and hard to damage or lose parts. Many screws and knobs are
covered, glued into place or otherwise made difficult to turn. Please do not try to tighten or loosen any screws or knobs. As described
in this manual, you can move the focus wheels and you can turn the Zoom eyepiece to change the power of magnification but please
do not try to turn any other screws or knobs.
The various covers and caps are tied to the telescope to prevent loss. Please do not detach the various strings.
Getting Started
Please read the instructions and practice with the telescope inside before you take it out in the dark. The image will be much better if
you let the telescope cool down to air temperature before you start observing.
This is a “push-to” telescope. Once you find what you are looking for, you can either watch the object move through your “field of
view” (what you see through the eyepiece) and then reposition the telescope, or keep pushing the scope to hold the object in the center
of the eyepiece. The objects move through the field of view primarily due to the rotation of the Earth. Objects appear to move across
the field of view faster at higher magnifications. This is because the field of view becomes narrower.
Like many reflector telescopes, the image in the eyepiece is upside-down.
When looking at star charts you will have to keep this in mind.
Do You Wear Eyeglasses? If so, you will probably be able to observe with your glasses off by just refocusing the telescope to your
unaided vision. If your eyes are astigmatic, images will probably appear best with glasses on. This is because a telescope’s focuser
can accommodate for nearsightedness or farsightedness, but not astigmatism.
This is important enough to say again:
WARNING: Never look directly at the Sun through this telescope or its finder scope
- even for an instant - as permanent eye damage could result.
Young children should use this telescope only with adult supervision.
NEVER POINT THIS TELESCOPE AT THE SUN!