Tiffen 77mm 81A Warming Glass Filter #7781A

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 addition to the 81A, the 81 series includes the 81B, which is slightly stronger, the 81C with double the warming effect of the 81B, and the 81EF with an extremely strong warming effect. Other useful color correcting filters include the 82 series for a cooling effect, the 80 series for using daylight film in tungsten lighting, the 85 series for using tungsten film in daylight, and the FL-D and FL-B for using daylight and tungsten film in fluorescent lighting, respectively.

In essence, the 77mm 81A Warming Glass Filter is a versatile tool that can significantly enhance your photography experience and results.