Optical Design | : | Rowe-Ackermann Schmidt Astrograph |
Aperture (mm) | : | 203 mm (8 in) |
Focal Length | : | 400 mm (15.74 in) |
Focal Ratio | : | f/2.0 |
Central obstruction Diameter | : | 93mm |
Light Gathering Power | : | 843x |
Resolution (Rayleigh) | : | 0.68 arc seconds |
Resolution (Dawes) | : | 0.57 arc seconds |
Image Circle | : | 22mm (.86") Ø, 3.15° |
Useable field | : | 32mm (1.26") Ø, 4.6°, only minimal performance loss at edge of FOV |
Wavelength range | : | 390 - 800 nm |
Spot size | : | < 4.6 µm RMS across image circle |
Optical Coatings | : | StarBright XLT |
Off-Axis Illumination | : | 93% at 11mm (.43") off-axis |
Optical Window | : | 46mm (1.81") Ø |
Back focus with included camera adapter | : | 25mm (.98") |
Back focus from top of threaded collar | : | 29mm (1.14") |
Optical Tube | : | Aluminum |
Optical Tube Length | : | 628mm (24.7") |
Optical Tube Diameter | : | 235mm (9.3") |
Focuser | : | Ultra-Stable Focusing System |
Other Features | : | Air-cooling system, integrated filter mount |
Mount Type | : | Computerized Equatorial |
Instrument load capacity | : | 30 lbs (13.6 kg) |
Height adjustment range (includes mount and tripod) | : | 1118mm - 1626mm (44" – 64") |
Tripod Leg Diameter | : | 50.8mm (2") Stainless Steel |
Latitude adjustment range | : | 7° - 77° |
Accessory Tray | : | Yes |
Slew Speeds | : | 9 slew speeds - max speed 4°/second |
Tracking Rates | : | Sidereal, Solar and Lunar |
Tracking Modes | : | EQ North & EQ South |
Dovetail Compatibility | : | Dual saddle plates (Vixen and CGE saddle |
Number of Auxiliary ports | : | 3 Aux ports (1 hand control and 2 AUX ports for optional accessories) |
Autoguide port | : | Yes |
USB Port | : | Yes, input on Hand Control |
Power Requirements | : | 12V DC 3.5A (tip positive) |
Motor Drive | : | DC servo motors |
Alignment Procedures | : | 2-Star Align, 1-Star Align, Solar System Align, Last Alignment, Quick Align |
Periodic Error Correction | : | Yes |
Computerized Hand Control | : | NexStar+ hand control with LCD display, 19 fiber-optic backlit LED buttons |
NexStar+ Database | : | 40,000+ objects, 100 user defined programmable objects. Enhanced information on over 200 objects |
Software | : | Celestron's Starry Night Special Edition Software, SkyPortal App |