- Aperture : 90mm Fluorite apochromat
- Focal length : 500mm
- F-ratio : 5.6
- Lens configuration : 2 elements in 2 groups
- Coating : Fully multi-coated
- Physical length : 400mm
- Tube diameter : 80mm
- Weight : 1.8kg
- Filter : 82mm (front cap)
- Parts included : 2591, 7803, FTF-BORGII & FTF-2020BCR
- Notes :
90FLFTF- 90FL Feather Focuser Set
