Orion Observer II 70mm Altazimuth Refractor User Manual

INSTRUCTION MANUAL
IN 580 06/17
Orion
®
Observer
™
II 70mm
Altazimuth Refractor
#10275
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Orion Observer II 70mm Altazimuth Refractor Specifications

Optical Specifications

objective lens diameter	70 mm
effective focal length	700 mm
focal ratio	f/10
lens coatings	antireflection coated

Eyepiece Specifications

eyepiece magnification with 25mm eyepiece	28x
eyepiece magnification with 10mm eyepiece	70x
eyepiece barrel diameter	1.25 inch

Physical Characteristics

focuser type	rack-and-pinion
mount type	altazimuth yoke
total instrument weight	5 lbs. 8 oz.

Summary

Telescope Assembly Guide

Attach Tripod Legs

Guides attaching tripod legs to the yoke mount using bolts and wing nuts.

Attach Accessory Tray

Mount Optical Tube

Explains how to attach the optical tube to the altazimuth yoke mount using knobs.

Install Micro-Motion Rod

Attach Finder Scope

Insert Star Diagonal and Eyepiece

Preparing Telescope for Operation

Aligning and Using the Red Dot Finder Scope

Explains how to align the red dot finder scope with the main telescope for accurate aiming.

Astronomical Observing Guide

Understanding Seeing and Transparency

Eyepiece Selection and Magnification

Details how magnification is calculated and how to select eyepieces for different views.

Focusing the Telescope

Guides on how to achieve a sharp focus using the focuser drawtube and wheels.

Observing the Moon

Observing the Planets

Tips for viewing planets, including references for tracking and recommended accessories.

Observing Deep-Sky Objects