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The 81B color correction filter warms the ambient light entering the lens by 300° Kelvin by adding orange to the overall exposure
while the low-profile form eliminates vignetting when used with ultra-wide angle lenses
It has been lab tested and confirmed to work without vignetting
effect can be minimized or exaggerated by changing the aperture
The absorption peak is in the range that corresponds to the film's green spectrum
Hoya HMC UV-IR Cut Filter for Digital Imaging Size:67mm - $147.90 The 81B color correction filterDescription The Hoya UV IR Cut filter cuts higher frequency ultra violet (UV) rays and lower frequency infrared (IR) light rays, allowing only light rays in the visible spectrum to pass through the filter and into the camera. This filter also reduces the effects of atmospheric haze.