Celestron 21035 User Manual

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ENGLISH

Celestron 21035 Specifications

General

Model	21035
Optical Design	Refractor
Focal Ratio	f/10
Mount Type	Altazimuth
Eyepiece 1	20 mm (35x)
Eyepiece 2	10 mm (70x)
Finderscope	5x24
Highest Useful Magnification	165x
Lowest Useful Magnification	10x
Limiting Stellar Magnitude	11.7
Resolution (Rayleigh)	1.99 arc seconds
Resolution (Dawes)	1.66 arc seconds
Light Gathering Power	100x
Optical Coatings	Fully Coated
Aperture	70 mm
Tripod	Aluminum
Focal Length	700 mm (28 in)
Tube Length	27 in (686 mm)

Summary

Introduction

Assembly

Setting up the Tripod

Instructions for extending and adjusting tripod legs for desired height.

Attaching the Telescope Optical Tube to the Tripod

Steps to securely mount the telescope optical tube onto the tripod platform.

Moving the Travel Scope Manually

Explanation of controlling telescope movement using pan handle and locking knobs.

Installing the Diagonal & Eyepiece

Guide for attaching the diagonal prism and eyepiece to the telescope tube.

Installing the Finderscope

Instructions for mounting the finderscope bracket and the finderscope itself.

Aligning the Finderscope

Steps to align the finderscope with the main telescope for easier targeting.

Telescope Basics

Focusing

How to adjust the focus knob to achieve a clear image.

Calculating Magnification

Formula and explanation for determining telescope magnification with different eyepieces.

Determining Field of View

How to calculate the actual field of view using eyepiece data and magnification.

General Observing Hints

Advice on optimal conditions and practices for better viewing.

Astronomy Basics

The Celestial Coordinate System

Explanation of R.A. and Declination for locating celestial objects.

Motion of the Stars

How Earth's rotation affects the apparent movement of stars in the sky.

Celestial Observing

Observing the Moon

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

Observing the Planets

Guidance on viewing planets like Jupiter, Saturn, and Mars.

Observing the Sun

Crucial safety precautions and methods for observing the Sun.

Observing Deep-Sky Objects

Introduction to deep-sky objects and optimal viewing conditions.

Star Hopping

Technique for finding celestial objects using star patterns as guides, including Andromeda.

Advanced Star Hopping Techniques

Finding M57, using averted vision, and importance of dark locations.

Seeing Conditions

Transparency

Clarity of the atmosphere affected by clouds, moisture, and particles.

Sky Illumination

Brightness of the sky from Moon, aurorae, light pollution affecting visibility.

Seeing

Atmospheric stability affecting image detail and sharpness.

Telescope Maintenance

Care and Cleaning of the Optics

Instructions for cleaning telescope lenses and handling dew build-up.

Travel Scope Specifications