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Orion StarBlast II 4.5 EQ User Manual

Orion StarBlast II 4.5 EQ
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INSTRUCTION MANUAL
IN 576 Rev. A 02/17
Orion
®
StarBlast
II 4.5 EQ
#9250 Equatorial Newtonian Reflector Telescope
Customer Support:
www.OrionTelescopes.com/contactus
Corporate Offices:
89 Hangar Way, Watsonville CA 95076 – USA
Copyright © 2017 Orion Telescopes & Binoculars
All Rights Reserved. No part of this product instruction or any of its contents may be reproduced, copied,
modied or adapted, without the prior written consent of Orion Telescopes & Binoculars.
Providing Exceptional Consumer Optical Products Since 1975
®
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Orion StarBlast II 4.5 EQ Specifications

Optical Specifications IconOptical Specifications
primary mirror diameter114 mm
effective focal length450 mm
focal ratiof/3.9
minor axis of secondary mirror34 mm
Eyepieces IconEyepieces
eyepiece diameter1.25 inches
eyepiece magnification with 25mm eyepiece18x
eyepiece magnification with 10mm eyepiece75x
Physical Characteristics IconPhysical Characteristics
total instrument weight17 lbs
mount typeEQ-1, German equatorial
tripod materialAluminum

Summary

Unpacking

Parts List

Assembly

Getting Started

Balancing the Telescope

Ensuring smooth movement of the telescope on both axes of the equatorial mount by proper balancing.

Focusing the Telescope

How to achieve sharp focus on celestial objects using the focuser.

Do You Wear Eyeglasses?

Tips for observing while wearing eyeglasses and dealing with astigmatism.

Operating the EZ Finder II Reflex Sight

How to use the EZ Finder II reflex sight for aiming the telescope.

Installing the Battery in the EZ Finder II

Instructions for inserting the CR2032 battery into the EZ Finder II reflex sight.

Setting Up and Using the Equatorial Mount

Polar Alignment

Aligning the equatorial mount with the Earth's rotational axis for tracking celestial objects.

Use of the R.A. and Dec. Slow-Motion Control Cables

How to use slow-motion cables for fine adjustments of telescope position.

Tracking Celestial Objects

How to keep celestial objects in the field of view using the R.A. slow-motion control.

Understanding the Setting Circles

Explanation of R.A. and Dec. setting circles for locating celestial objects by coordinates.

Calibrating the Right Ascension Setting Circle

Procedure to calibrate the R.A. setting circle for accurate object location.

Finding Objects with the Setting Circles

Steps to locate celestial objects using calibrated setting circles and the reflex sight.

Collimating the Optics

The Collimating Cap and Primary Mirror Center Mark

Description of tools used for collimating: collimating cap and primary mirror center mark.

Aligning the Secondary Mirror

Procedure to adjust and center the secondary mirror for proper optical alignment.

Aligning the Primary Mirror

Procedure to adjust the primary mirror tilt to center the reflection of the secondary mirror.

Star-Testing the Telescope

Using star tests to determine if the telescope optics are accurately aligned.

Astronomical Observing

Choosing an Observing Site

Tips for selecting an optimal location for observing celestial objects.

Seeing" and Transparency

Understanding atmospheric conditions affecting image quality and visibility.

Cooling the Telescope

Importance of allowing the telescope to reach thermal equilibrium before observing.

Let Your Eyes Dark-Adapt

The process and importance of dark-adapting your eyes for better night vision.

Eyepiece Selection

How to choose and use different eyepieces to achieve various magnifications.

What to Expect

What celestial objects can be observed and what to expect visually.

A. The Moon

Tips for observing the Moon, including best phases and using a Moon filter.

B. The Planets

Information on observing planets and how to find them using charts.

B. The Sun

Warning about observing the Sun and methods for safe daytime viewing.

D. The Stars

Observing stars, including double stars and their colors.

E. Deep-Sky Objects

Guidance on observing faint deep-sky objects under dark skies.

Care and Maintenance

Cleaning Optics

Instructions for cleaning telescope eyepieces and mirrors, and precautions.

Specifications

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