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What is actual use of 18% gray/green strip?*

1 Answer  |  Asked By: Swati   4   
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One Answer to “What is actual use of 18% gray/green strip?*”

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It\’s a card for taking light meter readings from. The traditional Kodak card came white a white side and a grey side.

Here\’s the deal. It you take your camera and use its light meter to read a white buidlng and make an exposure, all of your OTHER shades or colors not as bright will go dark, some really dark. If you read a red barn and make you exposure, all of your OTHER brigher shades or colors will go lighter, some so \”chalky,\” they lose all of their detail, such as lines..

If, instead, you use your camera\’s meter to read a grey card and set your exposure from it, the shades and colors will reproduce pretty much as they are to your eye. EXCEPT, the brightest shades or colors will chalk in bright sunlight.

The byword in black and white film photography is \”expose for the shadows; develop for the highlights. Basically, this means taking a meter reading of the shadows (about two stops under a grey card reading) and developing the film for a shorter duration than normal. It\’s a little complicated in that mathematical formulas are used to determine the latter, as well as developers you mix by hand as opposed to buying developers pre-mixed..

Grey cards of 18% grey are not nearly as crucial to color photography, although if has some applications for serious photographers.

By: rfb   64
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