Worthwhile Optional Accessories; Specifications - Orion SpaceProbe II 76mm Instruction Manual

Figure 18
. The Kellner eyepieces have barrels threaded to
accept optional Orion 1.25" filters. A Moon filter is useful for cutting
glare and revealing more detail on the lunar surface.
in temperature and humidity. Do not store the telescope out-
doors, although storage in a garage or shed is OK. Small com-
ponents like eyepieces and other accessories should be kept in
a protective box or storage case. Keep the dust cover (M) on the
front of the telescope when it is not in use.
Your reflector telescope requires very little mechanical mainte-
nance. The optical tube has a smooth painted finish that is fairly
scratch-resistant. If a scratch does appear on the tube, it will not
harm the telescope. If you wish, you may apply some auto touch-
up paint to the scratch. Smudges on the tube can be wiped off
with a soft cloth and household cleaning fluid.
Cleaning Optics
You should not have to clean the telescope's mirrors. Covering
the telescope with the dust cap when it is not in use will help pre-
vent dust from accumulating on the mirrors. Even a little dust on
the mirror surfaces will not affect the optical performance in any
way. If you feel the mirrors need to be cleaned, please contact
Orion Customer Service at 800-676-1343 for guidance.
To clean the eyepiece lenses, any quality optical lens cleaning
tissue and optical lens cleaning fluid specifically designed for
multi-coated optics can be used. Never use regular glass clean-
er or cleaning fluid designed for eyeglasses. Before cleaning,
remove any loose particles or dust from the lens with a blower
bulb or soft brush. Then apply some cleaning fluid to a tissue,
never directly on the optics. Wipe the lens gently in a circular
motion, then remove any excess fluid with a fresh lens tissue.
Oily fingerprints and smudges may be removed using this meth-
od. Use caution; rubbing too hard may scratch the lens. On larger
lenses, clean only a small area at a time, using a fresh lens tis-
sue on each area. Never reuse tissues.
When bringing the telescope inside after an evening's viewing
it is normal for moisture to accumulate on the optics due to the
change in temperature. We suggest leaving the telescope and
eyepieces uncovered overnight to allow the condensation to
evaporate.
7. Worthwhile Optional
Accessories
• Moon Filter – A 1.25" Moon filter will cut down the strong
glare of sunlight reflected from the Moon, making Moon
viewing more comfortable and revealing more surface
detail. The filter threads into the bottom of the Kellner eye-
pieces that came with your telescope (Figure 18).
• Barlow Lens – A 2x Barlow lens doubles the magnify-
ing power of any eyepiece it's used with, giving you a big
power boost to get in closer to your target object. You just
insert it between the diagonal and the eyepiece.
• Planisphere – A nifty "star wheel" that shows what stars
and constellations are visible in the sky at any time of any
night. Just set the date and time see a mini representation
of your local night sky. Great for identifying what you see
and planning an evening's observing session.
• Star Map – More detailed than a planisphere, a star
map is essential for locating interesting celestial objects
to observe with your telescope. Nowadays many mobile
astronomy apps feature customizable star maps that you
can access on your smartphone or tablet while you're at
the telescope.
Orion carries these and many other useful accessories to
help enhance your viewing experience with your telescope.
Visit our website at www.OrionTelescopes.com.

8. Specifications

Optical tube material: Rolled steel
Primary mirror diameter: 76mm (3.0")
Primary mirror coating: Aluminum with silicon dioxide
(SiO2) overcoat
Secondary mirror minor axis diameter: 19.9mm
Focal length: 700mm
Focal ratio: f/9.2
Focuser: Rack-and-pinion, accepts 1.25" accessories
Eyepieces: 25mm and 10mm Kellner, antireflection coated,
1.25" barrel diameter, threaded for Orion filters
Eyepiece magnification: 28x (with 25mm eyepiece) and
Finder scope: Red dot finder scope
Mount: Altazimuth yoke
Tripod: Aluminum
Total instrument weight: 7.0 lbs.
70x (with 10mm eyepiece)
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