Key Features:

• OLV-37-03: ~ 0.3 density; for lower speed film (below ISO 250)

• OLV-37-06: ~ 0.6 density; for higher speed film (above ISO 250)

• Compresses the contrast range of the human eye to a level similar to color film; this allows better interpretation of the ratios of the bright and dark areas of a scene

• Provides both a useful overview of the lighting conditions of the scene, and also provides an indication of which areas of will be overexposed and underexposed

• Allows additional 37mm filter to be added via the front filter thread