| Takahashi Mewlon Series | |||
|---|---|---|---|
| μ-210 | μ-250 | μ-300 | |
| Effective aperture | 210mm | 250mm | 300mm |
| Focal length (prime focus) | 2415mm/1961mm w/reducer | 3000mm/2307mm w/reducer | 3572mm/2739mm w/reducer |
| Focal ratio (prime focus) | F/11.5-F/9.3 w/reducer | F/12-F/9.2 w/reducer | F/11.9-F/9.1 w/reducer |
| Resolution | 0.55" | 0.46" | 0.40" |
| Limiting magnitude | 13.4 | 13.8 | 14.2 |
| Light grasp | 900x | 1275x | 1837x |
| Image circle | ø18mm/ø39mm w/reducer | ø21mm/ø42mm | ø25mm/ø42mm w/reducer |
| Photographic field | 1.2° w/reducer | 1.0° w/reducer | 45' w/reducer |
| Total length of main tube | 700mm | 850mm | 1094mm |
| Diameter of main tube | ø244mm | ø280mm | ø324mm |
| Primary mirror | 220mm F/2.9 | 260mm F/3 | 310mm F/3 |
| Secondary mirror | 65mm /X4 | 72mm /X4 | 95mm /X4 |
| Secondary Obstruction | 0.31 | 0.29 | 0.29 |
| Finder scope | 7x50 6.3° | 7x50 6.3° | 11x70 4.2° |
| Gross wt. of main tube assembly | 8kg (17.6lb) | 12.5kg (27.5lbs) | 26kg (57.2lbs) |