Celestron C9-S, C8-S, C5-S instruction manual Appendix a Technical Specifications

Page 52

Appendix A – Technical Specifications

Advanced Series

11071/11072

 

11025/11026

11045/11046

 

 

C5-S

 

C8-S

C9.25-S

Specifications:

 

 

 

 

 

Optical Design

127mm(5") Schmidt-Cassegrain

 

203mm (8") Schmidt-Cassegrain

235mm (9.25") Schmidt-Cassegrain

Focal Length

1250mm F/10

 

2032mm F/10

2350mm F/10

Finderscope

 

6x30

 

6x30

6x30

Mount

CG-5 Equatorial

 

CG-5 Equatorial

CG-5 Equatorial

Eyepiece

25mm Plossl (50x)

 

25mm Plossl (81x)

25mm Plossl (94x)

Star Diagonal

1.25"

 

1.25"

1.25"

Accessory tray

 

Yes

 

Yes

Yes

Tripod

2" Stainless Steel

 

2" Stainless Steel

2" Stainless Steel

Technical Specs

 

 

 

 

 

Highest Useful Magnication

 

300x

 

480x

555x

Lowest Useful Magnification

 

18x

 

29x

34x

Limiting Stellar Magnitude

13

 

14

14.4

Resolution: Rayleigh

1.1arc seconds

 

.68 arc seconds

.59 arc seconds

Dawes Limit

.91 arc seconds

 

.57 arc seconds

.49 arc seconds

Photographic Resolution

 

200 line/mm

 

200 line/mm

200 line/mm

Light Gathering Power

329x unaided eye

 

843x unaided eye

1127x unaided eye

Field of View: standard eyepiece

 

.64º

.55º

Linear FOV (@1000 yds)

 

52.5 ft.

 

33.6 ft.

29 ft.

Optical Coatings - Standard

Starbright Coating

 

Starbright Coating

Starbright Coating

Secondary Mirror Obstruction

1.75"

 

2.7"

3.35"

by Area

12%

 

11%

13%

by Diameter

35%

 

34%

36%

Optical tube length

 

14 inches

 

17 inches

22 inches

Telescope Weight

 

48 lbs

 

54.5 lbs

73 lbs

 

 

 

 

 

 

Advanced GT

 

 

 

 

 

 

 

 

 

 

 

Additional Specifications

 

 

 

 

 

Hand Control

 

Double line, 16 character Liquid Crystal Display; 19 fiber optic backlit LED buttons

Motor: Type

 

DC Servo motors with encoders, both axes

 

Max Slew Speed

 

3º/second

 

 

 

Software Precision

 

24bit, 0.08 arcsec calculation

 

Hand Control Ports

 

RS-232 communication port on hand control

 

Motor Ports

 

Aux Port, Autoguide Ports

 

Tracking Rates

 

Sidereal, Solar and

Lunar

 

Tracking Modes

 

EQ North & EQ South

 

Alignment Procedures

 

AutoAlign, 3-Star Alignment, Quick Align, Last Align

 

Database

 

40,000+ objects, 400 user defined programmable objects.

 

Enhanced information on over 200 objects

 

Complete Revised NGC Catalog

 

7,840

 

 

 

Complete Messier Catalog

 

110

 

 

 

Complete IC Catalog

 

5,386

 

 

 

Complete Caldwell

 

109

 

 

 

Abell Galaxies

 

2,712

 

 

 

Solar System objects

 

9

 

 

 

Famous Asterisms

 

20

 

 

 

Selected CCD Imaging Objects

 

25

 

 

 

Selected SAO Stars

 

29,500

 

 

 

Total Object Database

 

45,492

 

 

 

52

Image 52
Contents Advanced Series Advanced Series GT Introduction Assembly Telescope Maintenance Page Advanced Series Advanced Series GT Setting up the Tripod C9.25-SAttaching the Equatorial Mount Installing the Counterweight BarAttaching the Center Leg Brace Installing the Counterweight Attaching the Hand Control Holder Advanced GT Models OnlyAttaching the Optical Tube to the Mount Attaching the Visual BackInstalling the Eyepiece Installing the Star DiagonalInstalling the Finderscope Removing the Lens Cap Rear CellMoving the Telescope Manually Balancing The Mount in R.AAdjusting the Mount in Altitude Adjusting the MountBalancing The Mount in DEC Adjusting the Mount in Azimuth Powering the TelescopeAttaching the Declination Cable For GT Models Only Advanced GT Hand Control Hand Control Operation Double StarsAlignment Procedures Startup ProcedureAuto Align Auto Three-Star AlignLast Alignment Quick-AlignRe-Alignment Object Catalog Selecting an ObjectSlewing to an Object Finding PlanetsTour Mode Constellation TourDirection Buttons Rate ButtonSetup Procedures Identify Precise GoTo Observing Tip Helpful Hint Utility Features Helpful Hint Advanced GT Image Orientation Aligning the Finderscope FocusingCalculating Magnification Determining Field of View General Observing HintsCelestial Coordinate System Motion of the Stars Latitude Scales Finding the North Celestial Pole DefinitionDeclination Drift Method of Polar Alignment Observing the Moon Lunar Observing HintsObserving the Planets Observing the SunSolar Observing Hints Observing Deep Sky ObjectsSeeing Conditions TransparencyPage Short Exposure Prime Focus Photography Eyepiece Projection FullLong Exposure Prime Focus Photography Planet ISO Moon Mercury Venus Mars Jupiter SaturnPage Terrestrial Photography MeteringReducing Vibration CCD ImagingAuto Guiding Care and Cleaning of the Optics CollimationCollimated telescope Should appear Symmetrical with Page Page Page Appendix a Technical Specifications Appendix B Glossary of Terms Page Eclipsing or obscuring the brightness of the star Appendix C Longitudes Latitudes Georgia Minnesota Rhode Island Canada Appendix D RS-232 Connection Additional RS232 Commands Appendix E Maps of Time Zones Page Page Page Page Page Page Page Celestron TWO Year Warranty
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C5-S, C9-S, C8-S specifications

Celestron, a leader in the field of amateur and professional astronomy, offers a range of telescopes ideal for both novices and experienced stargazers. Among their most celebrated models are the C8-S, C5-S, and C9.25-S, each designed with unique features and technologies that enhance the observational experience.

The Celestron C8-S is an iconic telescope known for its 8-inch aperture. This Schmidt-Cassegrain design combines a compact form factor with a powerful light-gathering capability, making it perfect for deep-sky observing. Its optical tube has a focal length of 2032mm, providing an excellent balance of wide field viewing and high magnification. The C8-S features Celestron's StarBright XLT optical coating, enhancing light transmission and contrast, ensuring that even faint objects are visible. With compatibility for various accessories and a sturdy mount, the C8-S stands as a versatile option for different observing styles.

Moving to the C5-S, this model boasts a 5-inch aperture while maintains a compact and portable design. It is particularly popular among travelers and casual astronomers who value convenience without compromising on quality. The C5-S also employs the Schmidt-Cassegrain design, providing sharp images and improved color correction. With its shorter focal length of 1250mm, the C5-S excels in both planetary and deep-sky observation. The telescope's lightweight build makes it easy to transport, while the integrated optical systems ensure a clear view of celestial objects.

The C9.25-S represents a step up in performance, featuring a 9.25-inch aperture that captures more light than its smaller counterparts. This telescope offers a versatile focal length of 2350mm, allowing for impressive high-power planetary views, as well as detailed observations of deep-sky objects. The C9.25-S utilizes a unique StarBright XLT coating and features advanced optics that minimize optical distortion, resulting in sharp, high-contrast images. It is equipped with a sturdy mount that ensures stability during extended observation sessions.

All three models are compatible with Celestron's advanced computer-driven mount systems, allowing for effortless tracking and alignment. With built-in features such as GoTo technology, users can easily locate thousands of celestial objects with the touch of a button. This combination of advanced optics, portability, and user-friendly technology makes the Celestron C8-S, C5-S, and C9.25-S excellent choices for anyone looking to explore the cosmos more deeply. Whether for casual stargazing or serious astronomical study, these telescopes deliver exceptional performance to meet a variety of needs.