ASTRO-PHYSICS 1200 Manual

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MODEL 1200 PARTS LIST

Polar axis assembly (right ascension – R.A.) with stepper drive

Declination (Dec.) axis assembly with stepper drive

Pier top adapter with three 5/16-18 x 5/8" button head screws with washers

(these will be attached to your pier post if you ordered one)

Stainless counterweight shaft with washer stop and black plastic knob (knob has 5/16 thread)

Dual axis quartz frequency control box

"Y" connector cable

D.C. power cord (cigarette lighter adapter on one end)

Hex key set

Piece of Velcro (to attach hand controller to surface of your choice)

In order to fully assemble your mount, you will need the following separately sold items: pier, counterweights, and

portable rechargeable battery pack. Several sizes and types are available for your selection. Many of these items will

be discussed throughout these instructions.

Several additional options will help to enhance your observing experience: JMI computerized digital setting circles,

and Santa Barbara Instrument Group ST-4 or ST-6 CCD Imaging camera/autoguider, polar axis telescope, and trays

for your pier.

INTRODUCTION

We recommend that you familiarize yourself

with the assemble and basic operation of the

mount indoors. The temperature will be

comfortable, the mosquitoes at bay, and

you'll have enough light to see the

illustrations and read the manual. Please

take particular note of counterbalancing, use

of the clutches and operation of the hand

controller.

If you were to take a long exposure

photograph with Polaris (often called the

North Star) in the center of the field, you

would discover that all stars seem to revolve

around Polaris. This effect is due to the

rotation of the earth on its axis. Motor driven

equatorial mounts were designed to

compensate for the earth's rotation by

moving the telescope at the same rate and

opposite to the earth's rotation. When the

polar axis of the telescope is pointed at the

celestial pole (polar aligned) as shown in the

diagram to the right, the mount will follow

(track) the motions of the sun, moon, planets,

and stars. As a result, the object that you are

observing will appear motionless as you

observe through the eyepiece or take

astrophotos.

For visual observation, a rough sighting of

Polaris through the hole in the polar axis is

ASTRO-PHYSICS

MODEL 1200 GERMAN EQUATORIAL WITH

DUAL AXIS QUARTZ DRIVE (1200DA)

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