[B10739F]107FL F3.9ED Astrograph Set Part # B10739F Description 107FL F3.9ED Astrograph Set Aperture 107mm Fluorite Focal length 420mm F-ratio 3.9 Lens configuration 6 elements in 5 groups Coating Fully multi-coated Physical length 445mm Tube diameter 115mm Weight 4.3kg Filter Parts included Notes 55mm image circle