System Type: Maksutov Cassegrain Catadioptric
Aperture: 4 Inches (100 mm) Clear Aperture
Focus:     Remotely Operated - 50 Meters thru Infinity
Focal Length:       6 Step Zoom, Remotely Selectable, All Parfocal. 360 mm f/3.6, 760 mm f/7.6, 1090 mm f/10.9, 1350 mm f/13.5, 2030 mm f/20.3 and 3100 mm f/31.
Neutral Density Filter System: Continuous - Clear thru 4.0 N.D. Serves as Auto-Iris with Manual Over-Ride, or Operator Controlled  Illumination.
System Power: 12 V D C
Outside Dimensions: 28" Long 10" High 6" Wide
Weight: Approx. 24 Lbs.