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Here you go Mick, all the dimensions you could want for the 12" GS Dobbie.
Aperture / Focal Length Aperture 300mm / Focal length 1500mm
Diameter Secondary 70mm - 23.3% linear obstruction
Primary mirror / substrate Precisely figured parabolical mirror - quality made by GSO
diffraction limited. Mirror substrate: BK-7
Focuser 2" metal focuser. Incl. 1.25" adaptor with brass compression ring
Tube Metal tube - length 145cm - diameter 36.5cm - weight: 19.5kgs
Rocker Box Height 64cm - Diameter 63.5cm - Weight 13.5kgs
Finderscope 8x50 finderscope with metal quick release bracket - multi-coated
Accessories 2" eyepiece TS RK 32mm
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