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A combination of two gray polarizing filters set in independently rotating frames. Rotating the frames varies the amount of light passed. Useful with exceptionally strong light sources, such as in solar photography, scientific applications, etc. Useful with movie cameras for fadeouts.

Available sizes and coatings
Size 39.0 46.0 49.0 50.0
Bayonet		 52.0 55.0 58.0
Standard - o o - o o o
HMC - - - - - - -
Ultra - - - - - - -
S-HMC - - - - - - -
Size 60.0
Bayonet		 62.0 67.0 72.0 77.0 82.0 86.0 95.0
Standard - o o o - - - -
HMC - - - - - - - -
Ultra - - - - - - - -
S-HMC - - - - - - - -
Bayonet 50: Used on older Hasselblad lenses.
Bayonet 60: Used on current Hasselblad lenses.