Tiffen 77mm 81A Filter

What sets the 77mm 81A Warming Glass Filter apart is its ability to effectively reduce excess blue tones that can impact the quality of daylight film, particularly when capturing sky or sea scenes or engaging in high altitude photography. This filter is also a valuable asset if your flash exposures tend to be too 'cool'. The 'A' in 81A signifies that it is the mildest member of the 81 series, with a filter factor of 1.4. This requires an additional 1/2 f-stop of light, ensuring optimal performance. Every light source, whether natural or artificial, has unique characteristics that influence color rendition on film. This is where color correcting filters, like the 77mm 81A Warming Glass Filter, come into play. They are meticulously designed to 'warm', 'cool', and/or correct for the myriad lighting variations you may encounter during your photography journey. Each filter possesses a 'filter factor', a measure of the light it absorbs. Cameras equipped with internal metering (through the lens) will automatically adjust the exposure, making your job easier. However, if you're using external or handheld meters, you'll need to account for this factor. It's important to note that modern strobes (flash) mimic midday sun, so any warming or cooling filtration with flash should be based on 'daylight'. The 81 series warming filters are available in several strengths and sizes, providing you with a range of options to suit your specific needs. In addi Manufacturer's Description The 81 series filters are useful with daylight corrected film in cool light conditions. As letters advance, density and warmth increases.