Celestron C5-S, C8-S, C9.25-S specification

determines the "seeing" quality. Under good seeing conditions, fine detail is visible on the brighter planets like Jupiter and Mars, and stars are pinpoint images. Under poor seeing conditions, images are blurred and stars appear as blobs.

The conditions described here apply to both visual and photographic observations.

Figure 6-1

Seeing conditions directly affect image quality. These drawings represent a point source (i.e., star) under bad seeing conditions (left) to excellent conditions (right). Most often, seeing conditions produce images that lie some where between these two extremes.

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Celestron C5-S, C8-S, C9.25-S instruction manual

C9.25-S, C5-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.

Contents

Advanced Series Advanced Series GT Introduction Assembly Telescope Maintenance Page Advanced Series Autoguider Port Advanced C8-SGT Shown C9.25-S Setting up the Tripod Attaching the Equatorial Mount Installing the Counterweight BarAttaching the Center Leg Brace Attaching the Hand Control Holder Advanced GT Models Only Installing the Counterweight Attaching the Visual Back Attaching the Optical Tube to the Mount Installing the Eyepiece Installing the Star DiagonalInstalling the Finderscope Eyepiece Moving the Telescope Manually Removing the Lens CapRear Cell Balancing The Mount in DEC Balancing The Mount in R.A Adjusting the Mount in Altitude Adjusting the MountAdjusting the Mount in Azimuth Attaching the Declination Cables For GT Models Only Powering the Telescope Advanced GT Hand Control Hand Control Operation Startup Procedure Alignment Procedures Auto Three-Star Align Auto Align Last Alignment Quick-AlignRe-Alignment Selecting an Object Object CatalogSlewing to an Object Finding Planets Constellation Tour Tour ModeDirection Buttons Rate Button Setup Procedures Identify Precise GoTo Observing Tip Helpful Hint Utility Features Helpful Hint Advanced GT Celestial Coordinate System Motion of the Stars Pointing at Polaris Latitude Scales Finding the North Celestial Pole Declination Drift Method of Polar Alignment Lunar Observing Hints Observing the MoonObserving the Planets Observing the Sun Observing Deep Sky Objects Solar Observing HintsSeeing Conditions TransparencyPage Short Exposure Prime Focus Photography Full Eyepiece Projection Planet ISO Moon Mercury Venus Mars Jupiter Saturn Long Exposure Prime Focus PhotographyPage Metering Terrestrial PhotographyReducing Vibration CCD Imaging Auto Guiding Collimation Care and Cleaning of the Optics Collimated 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 Communication Protocol Appendix D RS-232 Connection Reset The Position Of Azm Or Alt Additional RS232 Commands Appendix E Maps of Time Zones Page Page Page Page Page Page Page Celestron TWO Year Warranty