Technical data
The fellowing correcting lenses range:
+in 1D steps l1-4l6l8l10l15l20l0
-in 1D steps l1-4l6l8l10l15l20
Aperture wheel
Large spot, small spot,hemispot,red-free filter
Bulb: 2.5V 1.6W halogen lamp
Batteries: two “AA†batteries or two “AA†NiMH Rechargeable Battery