Hoya C12 Cooling Filter – 80A Color Conversion for Tungsten Light macro Screw HOYA INSTANT ACTION ADAPTER

Screw HOYA INSTANT ACTION ADAPTER RING (sold separately) onto the lens

Zero exposure magnifying factor

Filter Factor: 2 stops Glass Type: Hoya Optical Number of Multi-Coatings: 6 layers / 3 per side Hardened Top Layer: No Anti-Static: No Frame Construction: Standard Profile / Aluminum Front Filter Threads: Yes

The Hoya 81B filter is helpful when:

Hoya C12 Cooling Filter – 80A Color Conversion for Tungsten Light macro Screw HOYA INSTANT ACTION ADAPTERDescription The C12 color conversion filter allows you to match the white balance of 3200K tungsten balanced (warm) ambient light sources entering the lens to match Daylight balanced 5500K films. C12 filters cool the light source by 2200K ( 120 mired shift) by adding a very dark blue to the overall exposure. The Hoya C12 filter is helpful when: You are using daylight balanced film and the light source is very warm and you want to to record accurate