INSTRUCTION MANUAL
150mm/1200mm
200mm/1200mm
254mm/1200mm
DOBS ONIAN S
Assembling Your Telescope
Aligning the Finderscope
Focusing
Using the optional Barlow Lens
Using the Tension Control Handle
Pointing the Dobsonian
Calculating the Magnication (power)
Calculating the Field of View
Calculating the Exit Pupil
Operating Your Telescope
Parts List
Base Assembly
Optical Tube Assembly
Proper Care for Your Telescope
3
6
3
4
5
Collimation
Cleaning Your Telescope
10
11
6
6
6
7
7
8
8
8
Sky Conditions
Selecting an Observing Site
Choosing the Best Time to Observe
Cooling the Telescope
Adopting Your Eyes
Observing the Sky
9
9
9
9
9
9
10
TABLE OF CONTENTS
B
efore you begin
C
aution!
This instruction manual is applicable to all the models listed on the cover. Read the entire
manual carefully before beginning. Your telescope should be assembled during daylight
hours. Choose a large, open area to work to allow room for all parts to be unpacked.
NEVER USE YOUR TELESCOPE TO LOOK DIRECTLY AT THE SUN. PERMANENT
EYE DAMAGE WILL RESULT. USE A PROPER SOLAR FILTER FOR VIEWING THE
SUN. WHEN OBSERVING THE SUN, PLACE A DUST CAP OVER YOUR
FINDERSCOPE TO PROTECT IT FROM EXPOSURE. NEVER USE AN
EYEPIECE-TYPE SOLAR FILTER AND NEVER USE YOUR TELESCOPE TO
PROJECT SUNLIGHT ONTO ANOTHER SURFACE, THE INTERNAL HEAT BUILD-UP
WILL DAMAGE THE TELESCOPE OPTICAL ELEMENTS.
4
BASE ASSEMBLY
2. Connect the assembly
to the round board C.
3. Attach the round plastic feet to board
D. Place the teflon pad in between
the assembly from step 2 and the
board D. Insert the black tube
from package 2 through the holes
in the centre of all the above.
1. Connect the board B to the
board A1 and A2. Make sure
the logos on the board A1
and A2 are on the outside.
The side of the board B with
three small holes should be
facing the front.
5. Position the accessory tray
over the 3 holes in the board
B and secure with the 3 small
screws provided.
6. Attach the handle from package
4 to the board B with the two
screws and the Alen wrench
from package 5.
7. Unassemble the cylindrical
saddle side bearings and the
screws from package 5. Attach
the cylindrical saddle side
bearings to the inside of board A
and A1 using the screws provided.
4. Take the bolt from package 2 with a
washer on it and insert it through the
tube. Secure with second washer and
the nut using the two wrench provided.
Do not over-tighten the bolt. This will
prevent the mount base from freely
spinning on the bottom round board.
8. Cover all visible small screws with the screw caps provided
D
C
C
Logo on the
other side
A2
A1
This side on
the outside
B
A1
A2
Logo
Logo on the
other side
Logo
Logo
Logo
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