CCA-250 specifications
Optical specifications
| Features | CCA-250 |
|---|---|
| Optical design | Modified Cassegrain |
| Diameter of the primary mirror | 260mm (Useful aperture : 250mm) |
| Features of the primary mirror | 260mm, Pyrex parabolical mirror, F/2.75 |
| Features of the secondary mirror | 125mm diameter, Pyrex spherical mirror |
| Mirror coatings | Protected high reflectivity |
| Obstruction | 0.58 |
| Corrector | 3 lenses, 80mm diameter |
| Lens coatings | Fully multicoated |
| Back focus (BFL) | 193.9mm (without CAA) 155.4mm (with CAA) |
| Resolving power | 0.47" |
| Limiting magnitude (visual) | 14.1 |
| Clarty | 1792x |
| Standard assembly | |
|---|---|
| Focal length | 1247mm |
| F/D ratio | F/5 |
| Image circle | 88mm, champ 4° (60% without vignetting) |
| Resolution | 2µ RMS (optical axis) 3µ RMS (10mm) 3µ RMS (20mm) 4µ RMS (30mm) 6µ RMS (40mm) |
| With 0.73x reducer [TKA82580] | |
|---|---|
| Focal length | 910mm |
| Focal ratio | F/3.6 |
| Image circle | 38mm |
| Resolution | 4µ RMS (optical axis) 7µ RMS (10mm) 10µ RMS (19mm) |
| With 1.5x extender [TKA82595] | |
|---|---|
| Focal length | 1880mm |
| Focal ratio | F/7.5 |
| Image circle | 40mm |
| Resolution | 4µ RMS (optical axis) 6µ RMS (10mm) 20µ RMS (20mm) |
| With 0.72x 645 reducer | |
|---|---|
| Focal length | 890mm |
| Focal ratio | F/3.6 |
| Image circle | 60mm |
| Resolution | 4µ RMS (optical axis) 4µ RMS (10mm) 5µ RMS (20mm) 6µ RMS (30mm) |
Equipment
| Specifications | CCA-250 |
|---|---|
| Focuser | Motorized, with translation of the secondary mirror |
| Cooling system | 3 fans with 3 temperature sensors |
| Electric power | 12V CC 0.75A |
| Plugs | 1 x Jack plug (power supply) 1 x USB 2.0 plug (focuser and fan control) |
| Control modes | Manual, with pads on the handbox Computerized, with software supplied (ASCOM compliant) |
Mechanical specifications
| Features | CCA-250 |
|---|---|
| Tube length | 870mm |
| Tube diameter | 306mm |
| Materials | Aluminium and carbon fiber |
| Tube weigth (OTA only) | 22.8kg |