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發表於 2014-4-3 23:17:26
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Hi vincecharus,
Green filter lightens foliage and will darken skies somewhat. Sometimes used to produce pleasing skin tones in portraits. In short, it will lighten colours of yellow, yellow-green, olive, greens and darken colours of blue, violet, magenta, red, maroon. Mostly, it need to increase 2 f stops.
Here are a few things you might consider, especially if you are relatively new to using color filters:
Nothing beats experience. Trying filters with your choice of film is the best way to get a feel for the effect they will have and the exposure compensation needed.
Experiment. If possible,try making the image with and without a filter, bracket exposures and try different filters.
Think it through. Look carefully at what you are photographing and remember that a filter may affect several of the objects in the image, not just the one that you are concentrating on. Even then, you can expect some unintended or unanticipated results.
Don't overfilter. Filters come in different strengths and it is a good idea to use the least amount filtration that will accomplish your goals. For example, it is easy to get carried away with trying for dramatic skies by using a dark red filter and, in the process creating a negative that is overly harsh and difficult to print, perhaps, partially due to the unanticipated results mentioned above.
Sources: http://www.fineart-photography.com/bwfilter.html
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