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Appendix A:
Technical Data
53809 Omegon Pro Ritchey-Chrétien 154/1370
Aperture
154mm
Focal length
1.370mm
Aperture ratio
f/9
Tube construction
Full tube type
Optics type
Ritchey-Chretien Cassegrain with two hyperbolic mirrors
Mirror substrate
BK-7/H-K9L
Obstruction caused by secondary mirror holder
72mm
Lens shades
7 pieces internally
Tube diameter
191mm
Tube length without focuser
410mm
Tube length with standard focuser
490mm
Tube weight without focuser
4.600g
Tube weight with focuser
5.400g
Focuser
2” Crayford focuser with 10:1 gear reduction and reducer from
2” t0 1.25”, fully rotating
Focuser connection thread
M90x1mm
Focuser adjustment travel
34mm
Focuser extension sleeves
2x 25mm; 1x 50mm
Finderscope
Optional
Finderbase
Vixen/Skywatcher
Focal distance from end of tube
240mm
Focal distance above the retracted focuser
237mm
Ventilator
No ventilator
