Apertura Dobsonian Telescope User manual

CAUTION!
NEVER ATTEMPT TO LOOK AT THE SUN WITH
YOUR APERTURA™DOBSONIAN TELESCOPE
UNLESS YOU HAVE A FULL-APERTURE
SOLAR FILTER (NOT INCLUDED WITH
TELESCOPE)INSTALLED OVER THE OPEN END OF
THE OPTICAL TUBE.NEVER USE AN EYEPIECE-
MOUNTED SOLAR-FILTER ALONE AND ALWAYS
COVER THE FINDERSCOPE EYEPIECE WITH A
PLASTIC DUST CAP.WITHOUT A FULL-
APERTURE SOLAR FILTER INSTALLED,YOU RISK
SEVERE EYE DAMAGE AND PERMANENT
BLINDNESS!
Please take a few minutes to read over the
assembly instructions to familiarize yourself
with the individual parts and procedures
before attempting to assemble your
Apertura™ Dobsonian Telescope.
Before using your Apertura™ Dobsonian
Telescope, please review and follow the
“Procedure for collimation” section of this
manual. You must properly collimate your
telescope to achieve optimal viewing
through this quality optical instrument.
X

DOBSONIAN
TELESCOPE
Assembly Instructions and User’s Guide

Unpacking your Apertura™ Dobsonian Telescope
Parts list:
Optical Tube Box (package 1 of 2)
Dobsonian optical tube
8x50 90-degree right-angle finderscope
Plastic tube cover
Laser collimator
2 silver side bearings
Fan power pack (batteries not included)
Eyepieces:
30 mm (2”format)
9 mm (1.25”format)
2”-to-1.25” eyepiece adapter
35mm Extension Tube
Moon filter (1.25”format)

Base Mount Box (package 2 of 2)
Wood components:
1 small panel –front
1 large panel –right
1 large panel –left
2 large round base plates
Turntable hardware:
1 round plastic roller-bearing disc
2 metal discs
1 Four-hole eyepiece tray
1 handle
3 black plastic feet
1 Allen wrench
1 adjustment knob assembly:
1 bolt with knob head
1 large washer
1 small bearing washer
1 small washer
1 axle sleeve
10 long black Allen screws
(only 8 screws for the AD8 model)
2 medium silver Allen screws
3 medium Phillips screws
2 short black Phillips screws

Assembling the DOBSONIAN BASE HOUSING
Attach handle to the BASE FRONT with
two medium silver Allen screws. The
curved edge of the board is the top of
this part when vertical.
! IMPORTANT ! Make sure the flat face
of the embedded T-nuts are on the BACK
side of the board (opposite the handle).
Attach BASE RIGHT to BASE FRONT
with two long black Allen screws.
(The BASE RIGHT is the one with
two smaller pre-drilled holes for
the eyepiece tray)
Attach BASE LEFT to BASE FRONT
with two long black Allen screws.
Be sure all three sides are secure.
BACK

Locate the BOTTOM BASE PLATE.
The BOTTOM BASE PLATE has
3 holes around its edge and a
brass fitting in the center hole.
Attach the 3 feet to the BOTTOM
BASE PLATE’s bottom side with 3
medium Phillips screws, with the
wider side of the feet facing the
board.
(The bottom side of this plate has
the brass fitting almost flush with
the surface –see inset picture)
Locate the TOP BASE PLATE.
The TOP BASE PLATE has
several holes around its edge
(not counting center hole).
Model AD8 = 4 holes
Model AD10, AD12 = 6 holes
Turn the completed BASE
HOUSING upside down.
Align the holes of the UPPER
BASE PLATE with the
holes of the BASE HOUSING.

Screw long black Allen screws through
the BOTTOM BASE into the BASE
HOUSING making sure the side with
the recessed holes is facing away from
the BASE HOUSING.
Place BOTTOM BASE PLATE with
feet facing down.
Insert AXLE SLEEVE into the Center
hole.
ROLLER BEARING ASSEMBLY
Place one of the two METAL DISCS
on the BOTTOM BASE PLATE aligning the
AXLE SLEEVE to hole in the Center.
(It can be flipped either way)

Now place the ROUND PLASTIC
ROLLER-BEARING DISC over the first
METAL DISC.
(It can be flipped either way)
Follow this with placing the
second METAL DISC over the
ROLLER-BEARING DISC.
(It can be flipped either way)
Pick up the BASE HOUSING
with UPPER BASE PLATE
already attached and place it
onto the AXLE SLEEVE of the
BOTTOM BASE PLATE.

Assemble washers onto the
ADJUSTMENT BOLT in this order:
Small washer
Ball bearing washer
Larger washer
Thread the ADJUSTMENT BOLT
through all of the assembled base
parts. Tighten the knob until it feels
firm but not too tight.
TIP: Tightening or loosening this
knob is how you will adjust the
amount of effort it takes to rotate
your Apertura™ Dobsonian
telescope on its base.
Attach the 4-HOLE EYEPIECE TRAY
to the BASE RIGHT panel of the
BASE HOUSING ASSEMBLY using
the two pre-drilled holes and two
small black Phillips screws.