B+W 52mm E 81B Filter Warming Filter (Non F-Pro) PROLINE - MPN: 65-030231-OSP
This item is a older non F-Pro series Filter. Same Standard SC coated product. Exposed filter ring depth of this filter is 5mm versus the 4mm of the F-Pro Series
The B+W 81B Filter is a color conversion filter that helps to slightly decrease color temperatures and provide a warming effect. The 81B filter adds more warmth to the image for use with tungsten films in natural lighting. It provides a decrease of 300K, helping to render the scene more similarly to incandescent illumination.
There is a 1.5x filter factor with this filter, requiring an increase of 0.6 stop for normal exposure. B+W filters are constructed from high quality Schott glass for increased optical clarity and color fidelity. They feature a brass filter ring for durability as well as jamming prevention.
Color conversion filter helps to slightly decrease color temperatures and provide a warming effect.
Provides a decrease of 300K for use of tungsten-based films in daylight situations.
Constructed from high quality Schott glass for optical clarity.
Brass filter ring helps to prevent jamming and provides additional strength.
81B Filter for Color Conversion
Warming Filter to Decrease Color Temp
Rugged Black Brass Filter Ring
High Quality Schott Glass
Type: Warming filter
Filter Factor: 1.5 (0.6 stop)
Effect: Provides decrease in color temperature for warming effect
Color Temperature: -300K
Construction: Schott Glass
Front Filter Thread Size: 55mm
Front Lens Cap Size: 55mm