BORG 55FL F3.6 Astrograph Feather Touch focuser set.
- Aperture : 55mm Fluorite apochromat
- Focal length : 200mm
- F-ratio : 3.6
- Lens configuration : 6 elements in 5 groups
- Coating : Fully multi-coated
- Physical length : 180mm
- Tube diameter : 80mm
- Weight : 1.1kg
- Parts included : 2555, 7051, 2 x 7026, FTF-BORGII, FTF-M57, 7352 & 7880
- Notes : FTF-M57 is 7901 version.