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The B+W Filter Company has been manufacturing optical filters for over 50 years. Their filters use Schott optical glass from which the filters are diamond cut, precision ground and then polished to ensure flatness on both surfaces and uniform thickness throughout. These, among other innovative measures, allow them to offer filters that meet the needs of even the most discriminating users.
B+W 81B
The 81B makes possible a stronger color temperature balance from artificial light sources to 3500 degrees which also results in a slightly warmer color reproduction. In addition, when using artificial light for portraits, especially when more flattering warmer colors are appropriate (portraits of women and children), this filter is highly recommended. Filter factor is approx. 1.2.
Skip Features
Filter - Coating
Standard
Filter - Factors & F-stops
f-stop = 1/2, Filter Factor = 1.4,
Filter - Type of Effect
Colour Correction, Warm Effect,
Filter - Fitting Type
Screw In
Filter - Thread Size
67mm