| Optical Design: |
Rowe-Ackermann Schmidt Astrograph |
| Aperture: |
279mm (11") |
| Focal Length: |
620mm (24.4") |
| Focal Ratio: |
f/2.2 |
| Central obstruction diameter: |
114mm (4.48") (41% of aperture diameter) |
| Light Gathering Power (Compared to human eye): |
1588x |
| Resolution (Rayleigh): |
0.49 arc seconds |
| Resolution (Dawes): |
0.41 arc seconds |
| Image Circle: |
43.3mm (1.7") Ø , 4.0° |
| Useable field: |
52mm (2.04") Ø , 4.8° only minimal performance loss at edge of FOV |
| Wavelength range: |
400 - 700 nm |
| Spot size: |
< 4.4 μm RMS across FOV |
| Optical Coatings: |
StarBright XLT |
| Off-axis Illumination: |
83% at 21mm (0.82") off-axis |
| Optical Window: |
68mm (2.67") Ø |
| Back focus with included camera adapter: |
55mm (2.16") |
| Back focus from top of threaded collar: |
72.8mm (2.86") |
| Optical Tube: |
Aluminum |
| Optical Tube Length: |
838.2mm (33") |
| Optical Tube Diameter: |
330.2mm (13") |
| Focuser: |
Ultra-Stable Focus System |
| Finderscope: |
Not included |
| Optical Tube Weight: |
43 lbs (19.5 kg) |
| Other Features: |
Ventilation fan, dual dovetail mounting bars |
| Included items: |
42mm (1.65") T-thread camera adapter | 48mm (1.89") camera adapter | Dust cover | 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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