HOYA FILTERS - The Difference is Clear

These are light balancing filters used to decrease the color temperature slightly for a warmer (redder) tone.
Corrects the tendency toward bluish tones. For example, the 81A should be selected when using tungsten Type B color film (3200°K) with photoflood lamps (3400°K) These filters can be used together.

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	o	o
HMC	-	o	o	o	o	o	o
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	o	o	o	o	o
HMC	o	o	o	o	o	o	-	-
Ultra	-	-	-	-	-	-	-	-
S-HMC	-	-	-	-	-	-	-	-

Bayonet 50: Used on older Hasselblad lenses.
Bayonet 60: Used on current Hasselblad lenses.