- Focal Ratio: f/1.9
- Focal Length: 684mm
- Maximum Usable Sensor Size: 27mm Diagonal (APS Format)
- DSLR Compatible
- Field of View (with 27mm sensor): 2.4 degrees
- Camera Adapter Threaded for 2" (48mm) Filters
- Backfocus (from mounting thread to focal plane): 67.4mm (2.65")
- Length (without camera adapter): 5.1"
- Diameter: 4.9"
- Weight: 3.1 lbs