[71FTF20]71FL Series 80 Feather Touch Focuser Set Part # 71FTF20 Description 71FL Series 80 Feather Touch Focuser Set Aperture 71mm Fluorite Focal length 400mm F-ratio 5.6 Lens configuration 2 elements in 2 groups Coating Fully-multi-coated Physical length 330mm Tube diameter 80mm Weight 1.1kg Filter 72mm (front hood) Parts included 2573, 7803, FTF-BORGII & FTF-2020BCR Notes