Zhumell Dobsonian User Manual
DOBSONIAN
TELESCOPES
SPECIFICATIONS
OPTICAL TUBE ASSEMBLY
Type Reflector Reflector Reflector
Objective (mm) 204 254 304
Focal Length (mm) 1200 1250 1500
Highest Useful Magnification 480x 600x 718x
Resolving Power 0.57 0.46 0.38
Limiting Magnitude 14.04 14.52 14.91
Focal Ratio (Visual) F/5.91 F/4.92 F/4.93
Focal Ratio (Photographic) F/7.91 F/6.92 F/6.93
Eyepiece Format 1.25’’ or 2’’ 1.25’’ or 2’’ 1.25’’ or 2’’
Finder Scope 8x50 8x50 8x50
Mount Type Dobsonian Dobsonian Dobsonian
MOUNT
Materials Wood, Melamine, Teflon
Tube Mount Cradle Mount
Mount Adjustment Altitude-Azimuth
INCLUDED ITEMS
•Optical Tube Assembly
•8x50 Finderscope
•Dobsonian Cradle Mount
•Plastic Adjustment Handle
•Eyepiece Holder
•Laser Collimator
•Moon Filter
•Two Plossl Eyepieces
•Cooling Fan (10’’ and 12’’ Models)
•Allen Wrench (for assembly)
WARNINGS
•Do not use telescope or finderscope to look at the sun without
an appropriate solar filter. Doing so can cause permanent
and irreversible eye damage.
•Never use an eyepiece solar filter to view the sun. Doing so
may damage the telescope and your eyes.
•Make sure no screws are loose before using telescope.
•Do not drop, shake, or throw your telescope as doing so may
damage the telescope or people around you.
•Objects in telescope may be farther away than they appear.
•Eyepieces intended for external use only.
•Don’t worry, be happy...
Zhumell telescopes are precision astronomical instruments designed to be easy to use and versatile in their application. As with
any telescope, Zhumell telescopes require some technical knowledge of stellar movement and optical properties. We have tried to
provide the basics of telescope use and astronomical viewing in
this manual. If, after reading through this manual, you still have
questions regarding the setup and use of your telescope, please
feel free to contact us at info@zhumell.com or at (800)922-
2063. Our customer service representatives will be able to help
address any problems you are having with your Zhumell telescope. We also have more information available on our website
at www.zhumell.com. Please let us know about your experiences
with your Zhumell telescope. We would like to hear your feedback and see your astrophotographs. Enjoy your Zhumell.
INTRODUCTION
Your Zhumell Dobsonian telescope is packed in two boxes. One box
includes the optical tube and accessories; the other box contains the mount
and accessories.
PARTS LIST
1 - Wood base, including two base
plates, two side panels, one front
brace, one axle (2’’ screw, two
washers, one metal bushing, one
nut) and eight or ten self-tapping
wood screws;
2 - Handle with two 1’’ screws;
3 - Three plastic feet with three self-
tapping wood screws;
4 - Eyepiece holder with two self-
tapping wood screws;
5 - Side-spring system (including two
springs, two nylon pull-loops,
two washers, two black Phillips
screws, four black nylon spacers,
and two bolts with round knobs).
MOUNT (SMALL BOX):
Side Panels (2) and Front Brace
Base Plate
Axle
Spring System
Mount Screws
Base Feet
Eyepiece Holder
1 - Optical tube with side bearings,
finderscope mounting slot,
Crayford focuser, and two dust
covers (optical tube and focuser);
2 - Finderscope bracket;
3 - 8x50 finderscope with o-ring.
OPTICAL TUBE (LARGE BOX):
Finderscope and Bracket
OTHER PARTS (INNER BOX):
1 - Moon filter (1.25’’ format);
2 - 9 mm Plossl eyepiece (1.25’’ format);
3 - 32 mm Plossl eyepiece (1.25’’ or 2’’ format);
4 - Laser collimator;
5 - Allen wrench.
Laser Collimator
Eyepiece and Moon Filter
ALSO NEEDED (USER SUPPLIED):
1 - Phillips Screwdriver;
2 - Adjustable Wrench.
ASSEMBLING YOUR TELESCOPE
BASE ASSEMBLY
1. Locate the bottom base plate (includes
teflon pads).
2. Turn bottom base plate upside-down (i.e.,
teflon pads down).
Note: You will need a user-supplied Phillips screwdriver and a usersupplied adjustable wrench to assemble the telescope.
1
3
3. Attach plastic feet to bottom
base plate with 2’’ screws and
set aside.
4. Locate the top base plate, the
two side panels, and the front
brace.
10. Place a washer onto bolt
and slide bolt through the
axle sleeve (from top base
plate through to bottom base
plate).
11. Slide washer onto the bottom
of bolt.
12. Tighten nut onto bolt with
user-supplied wrench until
snug.
5. Screw front brace, handle grommets inwards
(shown) to side panels, spring grommets
outward (shown).
SPRING GROMMET
HANDLE GROMMET
5
SIDES AND FRONT ASSEMBLED
6. Screw 3-sided unit onto top base plate. The
base plate screw insets (shown) must face
away from the side brace assembly.
6
SCREW INSET
7. Place bottom base plate
on ground (feet down
and Teflon pads up) and
place axle sleeve into
center hole.
7
8. Center top base plate (with panels
attached) over bottom base plate and
slide onto axle sleeve.
9. Tip unit onto its side.
8
12
11
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