Light Control

27

Factory Settings

27

Version

27

Get Alt-Az

27

Goto Alt-Az

27

Hibernate

27

Turn On/Off GPS

27

TELESCOPE BASICS

29

Image Orientation

29

Focusing

30

Aligning the Finderscope

30

Calculating Magnification

30

Determining Field of View

31

General Observing Hints

31

ASTRONOMY BASICS

32

The Celestial Coordinate System

32

Motion of the Stars

33

Finding the North Celestial Pole

35

Declination Drift Method of Polar Alignment

36

CELESTIAL OBSERVING

37

Observing the Moon

37

Lunar Observing Hints

37

Observing the Planets

37

Observing the Sun

37

Solar Observing Hints

38

Observing Deep Sky Objects

38

Seeing Conditions

38

Transparency

38

Sky Illumination

38

Seeing

38

ASTROPHOTOGRAPHY

40

Piggyback

40

Short Exposure Prime Focus Photography

41

Terrestrial Photography

42

Metering

42

Reducing Vibration

42

Auto Guiding

43

TELESCOPE MAINTENANCE

44

Care and Cleaning of the Optics

44

OPTIONAL ACCESSORIES

45

APPENDIX A – TECHNICAL SPECIFICATIONS

47

APPENDIX B – GLOSSARY OF TERMS

48

APPENDIX C – LONGITUDES AND LATITUDES

51

APPENDIX D – RS-232 CONNECTION

56

APPENDIX E – TIME ZONE MAP

58

SKY MAPS

60

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Celestron C100ED-R, C80ED-R manual Care and Cleaning of the Optics

C100ED-R, C80ED-R specifications

Celestron, a renowned name in the field of astronomy, has built a reputation for producing high-quality telescopes that are accessible to both amateur and professional astronomers alike. Among their impressive lineup are the Celestron C100ED-R and C80ED-R telescopes, both of which are crafted to enhance the observational experience through advanced optics and user-friendly features.

The Celestron C100ED-R, a 100mm refractor telescope, stands out for its premium extra-low dispersion (ED) glass, which delivers exceptional color correction and sharpness. This ED technology minimizes chromatic aberration, ensuring clearer and more colorful celestial images. The telescope boasts a focal length of 900mm, resulting in a focal ratio of f/9. This combination allows for high magnification capabilities while maintaining a wide field of view, perfect for observing both planetary details and deep-sky objects. The robust, yet lightweight design of the C100ED-R makes it highly portable, allowing for convenient stargazing sessions.

On the other hand, the C80ED-R is a 80mm refractor telescope that combines portability with performance. With its 600mm focal length and f/7.5 focal ratio, the C80ED-R is ideal for wide-field observations, making it easy to explore star clusters and large nebulae. Like its larger counterpart, the C80ED-R features ED glass, which prevents color distortion, allowing for clear and crisp images. The compact design is perfect for those who wish to travel or set up in tight spaces, ensuring that astronomy remains accessible.

Both telescopes are equipped with high-quality multi-coated optics that enhance light transmission, resulting in brighter images. Celestron's user-friendly mounting systems allow for smooth tracking of celestial objects, making it easier to follow objects as they move across the night sky. Additionally, these telescopes come with a variety of accessories, including premium eyepieces that enhance the viewing experience, and sturdy tripods that provide stable support during observations.

In summary, both the Celestron C100ED-R and C80ED-R offer exceptional features that cater to a variety of observing needs. With advanced ED optics, high-quality construction, and portability, they are ideal choices for aspiring astronomers looking to explore the wonders of the universe. Whether you're interested in planetary observation or deep-sky exploration, Celestron's C100ED-R and C80ED-R will not disappoint.