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#1
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circular polarizer
I respect that this is a "darkroom" forum. Where can I ask a question about
a circular polarizer? I checked out alt.photography and well, it's pretty bad, Thanks, Nat |
#2
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circular polarizer
nat spake thus:
I respect that this is a "darkroom" forum. Where can I ask a question about a circular polarizer? I checked out alt.photography and well, it's pretty bad, Try rec.photo.equipment.[plug in your format here]. (Two of the formats are .large-format and .35mm.) -- Second, Scientologists are like computers trying to run an emulation of another computer. It can be done, but the performance is awful. Scientologists are trying to run a bad copy of LRH. - Keith Henson, from alt.religion.scientology |
#3
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circular polarizer
"nat" wrote in message ... I respect that this is a "darkroom" forum. Where can I ask a question about a circular polarizer? I checked out alt.photography and well, it's pretty bad, Thanks, Nat Probably not quite on-topic here but what is your question? Briefly, a circular polarizer is a linear polar filter with the addition of a "retarder" plate consisting of a bi-refringent l/4 wave plate. The plate essentially undoes the polarizing on one side of the filter. This kind of filter works like a standard linear polarizer but delivers non-polarized light to whatever follows it. In photography circular polarizers are necessary for many cameras with through the lens exposure metering because the metering system may be sensitive to the polarity of the light coming in. Most makers of polarizing filters offer both linear and circular models. See http://www.fas.harvard.edu/~scdiroff...arization.html for a pretty good explanation of how they work. If you have a polarizer and don't know which type it is, hold it up to a mirror. A circular polarizer will look gray on one side and black on the other, a linear polarizer will look gray on both sides. -- --- Richard Knoppow Los Angeles, CA, USA |
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