BORG 90FL F3.9ED Astrograph Set
Specifications
- 90mm CANON Fluorite
- Focal length : 350mm
- F-ratio : 3.9
- 6-element optical system, including one fluorite and one ED
- 55mm image circle
- 80.0mm backfocus (60.0mm from 7352)
- Illumination : 82% full frame / 77% 55mm diagonal sensor
- Feather Touch Focuser (FTF-3215B-A) as standard
- Physical length : 365mm
- 3.6kg