- Flat field free of optical aberrations like field curvature, coma, astigmatism and chromatic aberration across an entire APS-C sensor.
- Unlike the larger RASAs that work with DSLR and large CCD cameras, the 8” model was designed with color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras in mind. The telescope does not work with standard DSLR cameras.
- Ultra-Stable Focus System – precision linear ball bearing virtually eliminates image shift.
- Integrated air cooling system –12V DC MagLev fan reduces cooldown time and provides optimal air flow while filtering out dust.
- Internal filter mount – seamlessly accommodates a Light Pollution Imaging Filter into the optical path.
- CGE dovetail mounting rail.
- Performs over a wider spectral range than most telescopes, from 400nm – 800nm, so more of the light passing through the astrograph is in sharp focus.
| OPTICAL TUBE INFO: |
|
| Optical Design: |
Rowe-Ackermann Schmidt Astrograph |
| Aperture: |
203mm (8") |
| Focal Length: |
400mm (15.74") |
| Focal Ratio: |
f/2.0 |
| Central obstruction diameter: |
93mm (3.66") (46% of aperture diameter) |
| Light Gathering Power (Compared to human eye): |
843x |
| Resolution (Rayleigh): |
0.68 arc seconds |
| Resolution (Dawes): |
0.57 arc seconds |
| Image Circle: |
22mm (0.86") Ø, 3.15° |
| Useable field: |
32mm (1.26") Ø, 4.6°, only minimal performance loss at edge of FOV |
| Wavelength range: |
400nm – 800nm |
| 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 |
| Finderscope: |
Not included |
| Optical Tube Weight: |
17 lbs (7.7 kg) |
| Other Features: |
Air-cooling system, integrated filter mount |
| Included items: |
M42 camera adapter | C-thread camera adapter | Fan battery pack |
| Dovetail: |
CGE Dovetail Bar |
| Solar Warning |
- Never look directly at the Sun with the naked eye or with an optic (unless you have the proper solar filter). Permanent and irreversible eye damage may result.
- Never use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it.
- Never leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.
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