Hoya 80A #7

The Hoya 80A #7 is a color conversion filter commonly used in photography to correct the color temperature of a light source. Here's what you need to know about it:

1. Color Temperature Correction: The Hoya 80A filter is primarily used to correct the color temperature of tungsten or incandescent light sources when shooting with daylight-balanced film or digital cameras. It converts the color temperature of the light from around 3200K (typical of tungsten lighting) to approximately 5500K (daylight-balanced).

2. Blue Color Filter: The 80A filter is a blue color filter. It works by absorbing the excess yellow/orange wavelengths present in tungsten light, which helps to balance the color temperature towards daylight.

3. Application: This filter is especially useful for outdoor photography when shooting under tungsten lighting conditions or when using tungsten-balanced film indoors. It helps maintain accurate color reproduction in your images.

4. Compatibility: The Hoya 80A filter is available in various sizes to fit different lens diameters. It typically comes in screw-on or square/rectangular filter formats, making it compatible with a wide range of lenses.

5. Multi-Coating: Some versions of the Hoya 80A filter may feature multi-coating, denoted by the "MC" designation, which helps reduce reflections, flare, and ghosting while improving light transmission and image contrast.

6. Effect on Exposure: It's essential to note that using a color conversion filter like the 80A will affect the exposure of your images. Since the filter absorbs light, it may require adjustments to your camera's exposure settings to compensate for the light loss.