A green filter, such as Green 11, can be used to lighten green foliage, to show more detail. It may also be used to provide more pleasing skin tones outdoors, especially against blue sky.
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Black and white imaging records only tonal differences between colored objects, which appear as black, white, or different shades of gray. Proper rendition depends on your own desires, and, for film, the differences between film sensitivity to colors and that of the eye. The latter is due to the fact that most panchromatic emulsions used are more sensitive to blue, violet and ultraviolet than to other colors. Therefore, blue appears as lighter on film than it does to the eye. This can make a blue-sky light enough to appear a similar shade of light gray as the clouds that are in it, making the clouds "disappear."A more "correct" cloud presence is obtained through the use of a yellow filter, such as a Yellow 8, which can absorb blue light, darkening the sky to more closely match what the eye would see. The Yellow 8 also acts as a general compensator for most subjects, giving a tonal rendition similar to that of the eye.
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Here's a simply elegant way to dial-in the filter you want for observing or photography. With the 5-Filter wheel, you can easily change filters without removing your eyepiece or camera. Just rotate the wheel and your filter securely clicks into place, ready to use. You don't even need to leave the eyepiece! Attaches directly to your telescope and accepts 1.25" accessories and Orion StarShoot or DSLR cameras. Requires additional 20mm focus travel. LRGB imaging filter set includes 1.25" Luminance (IR cutoff), Red, Green, and Blue filters designed for creating high-quality composite color astrophotos with CCD monochrome imagers. Their anodized aluminum cells thread into the 5-filter wheel.
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