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Celestron S 203/400 RASA 800 CGEM II GoTo
Combining a fast 203mm astrograph with CGEM II control, the Celestron S 203/400 RASA 800 CGEM II GoTo provides 400mm focal length and computerized equatorial operation.
- 203mm aperture supports pure imaging operation
- 400mm focal length uses f/2.0 optics
- CGEM II mount provides motorized equatorial movement
- 42mm and C-thread adapters included
- 7.7kg counterweight and tripod included
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Description
High-capacity equatorial support is the central configuration of the Celestron S 203/400 RASA 800 CGEM II GoTo, an 8-inch Rowe-Ackermann Schmidt Astrograph with a 400 mm focal length and listed f/2 optical ratio. Its CGEM II computerized German equatorial mount provides a 40-pound instrument capacity, motorized tracking, NexStar+ control, periodic error correction, autoguider support, internal cable routing, and a rigid platform for the RASA optical tube and imaging accessories.
The RASA 8 optical system includes StarBright XLT coatings, Ultra-Stable Focus System, internal imaging filter mount, integrated cooling, camera adapters, and a CGE dovetail rail, while the manufacturer identifies the system for color astronomical CMOS cameras, smaller CCD cameras, and compatible mirrorless cameras. Standard DSLR cameras are excluded from the stated RASA 8 camera configuration, so buyers must confirm sensor and adapter compatibility before purchase.
Key Features of Celestron S 203/400 RASA 800 CGEM II GoTo
This complete astroimaging package combines an 8-inch f/2 RASA optical tube with a CGEM II computerized equatorial mount, StarBright XLT coatings, precision focus system, integrated cooling, filter support, camera adapters, NexStar+ control, tripod, counterweight, and internal cable management.
- 203 mm Rowe-Ackermann Schmidt Astrograph
- 400 mm focal length with listed f/2 optical ratio
- CGEM II computerized German equatorial mount
- 40-pound instrument capacity
- StarBright XLT optical coatings
- Ultra-Stable Focus System
- Integrated filter mount and cooling system
- 42 mm and C-thread camera adapters
Computerized Deep-Sky Imaging
The supplied application focuses on automated deep-sky imaging of wide-field nebulae, galaxies, and star clusters, with the CGEM II mount providing motorized equatorial tracking while the f/2 optical tube supports short exposure imaging workflows and the final need for autoguiding, calibration, filters, and camera-specific accessories depends on the complete imaging setup.
Why Choose Celestron S 203/400 RASA 800 CGEM II GoTo
This model is a suitable choice when a buyer wants an 8-inch f/2 astrograph paired with a higher-capacity CGEM II mount, StarBright XLT coatings, precise focus control, integrated cooling, internal filtering, camera adapters, computerized tracking, and a rigid platform for supported deep-sky imaging applications.
- 40-pound CGEM II capacity for the listed telescope configuration
- Fast f/2 optical system with cooling and internal filter support
- Camera adapters, tripod, controller, counterweight, and power accessories included
Celestron 2-Year Limited Warranty
The supplied product information lists a 2-year limited warranty for this astroimaging system, while the current manufacturer listing provides separate camera and mount specifications, so buyers should confirm the applicable US warranty terms, optical coverage, CGEM electronics coverage, accessory coverage, registration requirements, and authorized service process before purchase.
Celestron S 203/400 RASA 800 CGEM II GoTo Specs
| Brand | Celestron |
| Full Model Code | Celestron RASA 8 CGEM II Computerized Telescope System |
| Country of Origin | United States / China |
| Optical Design | Rowe-Ackermann Schmidt Astrograph (4-Element Rare-Earth Lens Group with Spherical Primary Mirror) |
| Aperture | 203 mm (8.0 inches) |
| Focal Length | 400 mm |
| Focal Ratio | f/2.0 |
| Optical Coatings | StarBright XLT Reflective and Anti-Reflective Multi-Coatings with Broadband AR Lens Coatings |
| Central Obstruction Diameter | 93 mm |
| Central Obstruction by Diameter | 46% |
| Central Obstruction by Area | 21% |
| Resolving Power | 0.57 Arcseconds (Dawes), 0.68 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | Not Applicable (Pure Imaging Instrument) |
| Highest Useful Magnification | Not Applicable (No Visual Eyepiece Support) |
| Lowest Useful Magnification | Not Applicable (No Visual Eyepiece Support) |
| Optical Tube Material | Aluminum |
| Focuser Style & Mechanism | Ultra-Stable Focus System (USFS) with Precision Linear Ball Bearings Counteracting Focus Shift |
| Mirror Lock Mechanism | No |
| Optical Tube Dimensions | 235 mm x 628 mm |
| Optical Tube Weight | 7.70 kg (17.0 lbs) - Tube Only |
| Mount Attachment Type | CGEM II Motorized German Equatorial Mount with Dual-Saddle Plates and Internal Cable Routing |
| Finder Scope Specification | Not Included |
| Included Accessories | 42mm T-Thread Adapter, C-Thread Adapter, 12V DC Fan Battery Box, CGEM II Equatorial Mount Head, Heavy-Duty Steel Tripod (2-inch Legs), NexStar+ Hand Controller, 1x 7.7kg Counterweight, Car Battery Power Cord |
| Power Requirements | 12V DC, 3.2 Amps |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Mid-tier automated sky sweeping and sensor tracking, mating a wide 3.2-degree capturing field to a tracking head to automate sky coordinate targets without camera field rotation. |
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