 U. Trelum |
Using polarizer with DSLR I used a polarizer with my nikon D200 and found the images have a strange color shift and very contrasty Are polarizers not compatible with DSLRs?
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Sharon Day |
They are compatible. I have the D200 and I use the Nikon polarizing filter and it works just fine. I also have a Cokin which I don't like as well, but I wouldn't say it actually gives a strange color shift. Just a very slight one I don't really care for. Is your polarizing filter linear or circular? A linear filter would give you problems. I have used a linear filter but I had everything in manual including manual focus when using it.
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U. Trelum |
Thanks for that Sharon. Yes I use a Nikon polarizer. I attach the filter to the front of the lens and turn to get the polarizing effect. This what I thought is a circular filter. But now that you mention it it was given to me as a linear filter. How can I tell the difference?
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Sharon Day |
My circular polarizing filter says so on the ring, but my linear doesn't indicate it's linear. I can't tell difference by looking through them. I just now tried out my linear one on my macro lens and it wouldn't focus. I focused manually and it looked like the colors and exposure was ok.
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Alan N. Marcus |
A polarizing screen (polarizing filter) can be thought of as picket fence. Consider two kids, one on one side of a fence and one on the other. They are holding a rope. The rope transverses the fence via a missing picket. The kids draw the rope tight and pluck it like a guitar string. The rope can vibrate in one direction (plane) that’s up and down. It can’t vibrate side ways because it strikes the fence. That’s exactly how a polarizing screen works. The filter can be thought of having parallel lines ruled upon it. The lines allow light waves to transverse only if the waves are vibrating in the same plane as the ruled lines. All other light waves are halted. Light from the sun is not polarized -- meaning the light waves vibrate in all planes (up-down left-right – actually all orientations). When light filters through our atmosphere or when light reflects from non conductors (paint – glass – water – etc.) it is often polarized, meaning it vibrates principally in one plane. When a polarizing screen is mounted on a camera, one can rotate the filter and selectively halt some of the light rays. What you are doing is orienting the pickets (adjusting) them to pass/reject some light rays. The polarizing screen is helpful because it darkens sky without changing the color balance of the vista. Additionally it adds saturation and penetrates haze. Perhaps its most valuable function is to reduce reflections from glass, painted surfaces and water. The polarizing screen is linier meaning the lines (actually crystals) operate as if they were parallel ruled lines. A polarizing filter can encumber the auto focus and/or exposure sensors on some cameras (ones that use internal polarizing filters in the sensor light path). A circular polarizing filter is a dual filter (sandwich). The front glass is s linier, it stopps some rays, the second scrambles the rays that traversed the first causing them to have a random orientation. Both designs perform the same task. Alan Marcus
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U. Trelum |
Thank you Sharon and Alan for your help. I experimented a bit more and found that using Automactic Whitebalance of the camera left the image especialy the sky with a greyish tint in the normally blue sky. Setting the WB to sunlight fixed the problem. I guess I have to pay more attention to WB. Regards Udo
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Sharon Day |
Thanks for the info, Udo! I hadn't noticed that and will watch my WB as well.
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