| Takahashi ε-180ED | |
|---|---|
| Optical design | Hyperbolical Newton |
| Effective aperture | 180mm |
| Primary mirror diameter | 190mm |
| Secondary mirror (minor axis) | 80mm |
| Focal length | 500mm |
| Focal ratio | F/2.8 |
| Resolution | 0.64" |
| Limiting magnitude (visual) | 13.0 |
| Light grasp | 661x |
| Image circle | 44mm (60% not vignetted) |
| Back focus (BFL) | 56mm (from the end of the corrector) |
| Photographic assembly | M54mm female on the corrector (for wide T-mount) |
| Tube length | 570mm |
| Tube diameter | 232mm |
| Tube weight | 10.7kg |