Details
Features
General Features
- 8" Schmidt-Cassegrain Optical Tube Assembly
- Aluminum Optical Tube
- Celestron's premium StarBright XLT coatings
- 2032 mm focal length (f/10)
- 25 mm eyepiece included (81x)
- Visual back allows for use with 1.25" accessories
- 6x30 finderscope to help accurately find objects
- Star diagonal provides more comfortable viewing position when observing objects that are high in the sky
- Includes dovetail rail compatible with CG-5 Advanced Series mount
Additional Information
| Optical Design | Schmidt-Cassegrain |
|---|---|
| Aperture (mm) | 203.2 mm (8 in) |
| Focal Length (mm) | 2032 mm (80 in) |
| Focal Ratio | 10 |
| Eyepiece 1 (mm) | 25 mm (0.98 in) |
| Magnification 1 | 81 x |
| Finderscope | 6x30 |
| Star Diagonal | 1.25 |
| Optical Tube | Aluminum |
| Highest Useful Magnification | 480 x |
| Lowest Useful Magnification | 29 x |
| Limiting Stellar Magnitude | 14 |
| Resolution (Rayleigh) | 0.69 arc seconds |
| Resolution (Dawes) | 0.57 arc seconds |
| Light Gathering Power | 843 x |
| Secondary Mirror Obstruction | 2.5 in (64 mm) |
| Secondary Mirror Obstruction by Diameter | 31 % |
| Secondary Mirror Obstruction by Area | 9.77 % |
| Optical Coatings | StarBright XLT |
| Optical Tube Length | 17 in (432 mm) |
| Optical Tube Weight | 12.5 lbs (5.67 kg) |
| Dovetail Compatibility | CG-5 Mount |
Related Products
Check items to add to the cart or select all
Knowledge Base
- What size of scope is best for different kinds of objects?
- Aperture
- Focal length
- Contrast
- Light gathering power and magnitude limit
- Telescope-Astronomy Resources on the Web
- What does magnitude mean?
- Exit pupil
- What are diffraction-limited optics?
- What is the focal ratio? How is it related to the f-stop?
- Near focus
- Field of view
- Magnification or power
- Resolution - resolving power
- Optical design aberrations
- Why don't the images I see through my telescope look the same as photos I see taken with the same type of telescope?
- How far can I see with a telescope?
- How do you determine a telescope's magnification?
- Why does there appear to be a black circle in the middle of my image when I look at a star or planet?
- Which screws are safe to remove for mounting an accessory finderscope on my Celestron Schmidt-Cassegrain telescope (SCT)?
- What is back focus? What problems does it cause for visual and photographic use of my scope? What are related focus issues?
- I need to box up my scope and ship it. What's the best way to pack it?
- Why won't my image erecting eyepiece or image erecting diagonal always give right side up images with my scope?
- What is field rotation? How does it affect my scope's viewing and imaging?
- What is a star party? Where do I find information on star parties in and around my area?
- I "accidentally" took apart my eyepiece, removing the lens that goes closest to my eye. Help! How do I put it back together?
- I'm looking at my Celestron scope and it has a serial number on it. Can you tell me the model, type and year it was made?
- I want to use the focal reducer/corrector with an aftermarket eyepiece holder. What is the best spacing, focal length, etc?
- My images with a CCD camera are showing black or white streaks on the brighter stars. They are all bloomed out. What's wrong with my scope?
- What is the operating temperature range for Celestron's telescopes?
- How much will the addition of a focal reducer increase my scope's field of view?
- What is the size of the threading holding the visual back to my Schmidt-Cassegrain telescope? Is it the same for all Celestron SCTs?
- The standard visual back on my Schmidt-Cassegrain telescope (SCT) has threads on the outside of the barrel. What are these threads for?
Downloads
Manuals
Schmidt-Cassegrain Optical Tube Assembly Manual (895.93 KB | PDF)
Reference Materials
- Astronomy Basics (English, French, German, Italian, Spanish) (2.26 MB | PDF)
- Telescope Maintenance (English, French, German, Italian, Spanish) (640.68 KB | PDF)
- Telescope Basics (English, French, German, Italian, Spanish) (481.61 KB | PDF)
- Celestrial Observing (English, French, German, Italian, Spanish) (381.85 KB | PDF)
