Orion AstroView 120ST EQ User Manual

IN 155 Rev. B 02/09
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INSTRUCTION MANUAL
Orion
®
AstroView
™
120ST EQ
#9005 Equatorial Refracting Telescope

Orion AstroView 120ST EQ Specifications

Optical Specifications

objective lens diameter	120 mm
focal length	600 mm
focal ratio	f/5

Eyepiece Specifications

eyepiece 1	25 mm Plössl, fully coated
eyepiece 2	10 mm Plössl, fully coated
magnification with 25 mm eyepiece	24x

Finder Scope Specifications

finder scope magnification	6x
finder scope aperture	30 mm
finder scope type	achromatic, crosshairs

Summary

Parts List

Assembly

Balancing the Telescope

Aligning the Finder Scope

Setting Up and Using the Equatorial Mount

Polar Alignment

Explains how to align the mount with the Earth's rotational axis for tracking.

Aligning the Polar Axis Finder Scope

Details the procedure for aligning the polar finder scope.

Using the Polar Axis Finder

Understanding the Setting Circles

Calibrating the Right Ascension Setting Circle

Explains how to calibrate the R.A. setting circle for accurate pointing.

Finding Objects With the Setting Circles

Guides on using calibrated setting circles to locate astronomical objects.

Using Your Telescope—Astronomical Observing

Choosing an Observing Site

Advises on selecting the best location for observing.

Aiming and Focusing

Guides on aiming and achieving sharp focus with the telescope.

Observational Targets

Information on observing the Moon, Sun, planets, stars, and deep-sky objects.

Astrophotography

Moon Photography

Details how to photograph the Moon.

Planetary Photography

Explains photographing planets.

Piggybacking Photography

Terrestrial Viewing

Care and Maintenance

Cleaning the Optics

Provides instructions on cleaning optical surfaces.

Specifications