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Polarizer(s) questions
Is it necessary to use a circular polarizer with contrast detect auto-focus?
If so, would two circular polarizers work for a variable ND filter on such a camera? (Just for indoor portraits, web resolution) Eric Miller www.dyesscreek.com |
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Polarizer(s) questions
In article , Eric Miller
wrote: Is it necessary to use a circular polarizer with contrast detect auto-focus? circular polarizers are only required if there's a beam splitter in the optical path. If so, would two circular polarizers work for a variable ND filter on such a camera? (Just for indoor portraits, web resolution) use one circular and one normal, with the circular polarizer closest to the camera. |
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Polarizer(s) questions
On 8/3/2011 9:39 PM, Eric Miller wrote:
Is it necessary to use a circular polarizer with contrast detect auto-focus? Generally yes. While some autofocus systems will work with a linear polarize, you should test your system. If so, would two circular polarizers work for a variable ND filter on such a camera? (Just for indoor portraits, web resolution) I use a circular + a linear with the circular closest to the lens. the disadvantage is that you don't get true neutral density, you will lose some specular highlights that you want in your image. But the cost is substantially less than a variable ND filter. -- Peter |
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