Precision astronomical telescopes and mountings
| Optical Configuration | Newtonian reflector | ||||
| Effective Aperture | 254mm - (10") | 318mm - (12.5") | 368mm - (14.5") | 406mm - (16") | |
| Primary Mirror | Pyrex | ||||
| Focal Ratio | F/6 F.L.= 1524mm | F/5 F.L.= 1524mm | F/5 F.L.= 1842mm | F/5 F.L.= 2032mm |
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| Secondary Mirror | 46mm - (1.83") | 54mm - (2.14") | 66mm - (2.60") | 79mm - (3.10") | |
| Resolving Power | .45 arc sec. | .37 arc sec. | .33 arc sec. | .29 arc sec. | |
| Faintest magnitude | 13.8 | 15.0 | 15.3 | 15.6 | |
| Tube length | 1575mm - (62") | 1575mm - (62") | 1828mm - (72") | 2032mm - (80") | |
| Tube diam. | 305mm - (12") | 380mm - (15") | 416mm - (16.4") | 482mm - (19") | |
| Tube Weight | 18.2kg - (40 lbs.) | 25kg - (55 lbs.) | 32.7kg - (72 lbs.) | 43.2kg - (95 lbs.) | |
| Finder | 7 X 50mm | ||||
| Focuser | 2" dual speed Crayford | ||||