ASTRO-PHYSICS 400 Посібник

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MODEL 400 PARTS LIST

400 Equatorial Head with stepper motors on right ascension and declination axes

Stainless counterweight shaft with washer stop and black plastic knob (5/16-18 threaded rod)

Dual axis quartz frequency control box

"Y" connector cable

D.C. power cord (cigarette lighter adapter)

Black plastic knobs with ¼-20 threaded rod

1ea. Hex keys 3/16" and 5/16"

Red caplugs

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

In order to fully assemble and use your mount, you will need the following items sold separately: cradle plate, pier or

tripod, portable rechargeable battery pack and counterweights. 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: polar axis telescope with illuminator; high

resolution mounted encoders and JMI computerized digital setting circles, Santa Barbara Instrument Group ST-4 or

ST-6 CCD imaging camera/autoguider.

INTRODUCTION

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 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 fine.

However, if astrophotography is your goal,

accurate polar alignment is critical.

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.

ASTRO-PHYSICS

400 GERMAN EQUATORIAL MOUNT

WITH DUAL AXIS QUARTZ DRIVE

(SILVER-DOME KNOBS)