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11/10/2005 09:15:21 PM · #1 |
Hello,
My new polarizer rotates freely when installed. It has a white line on the rim. Does this line mean anything? Where should the line "line up"?
Thanks,
Kenskid |
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11/10/2005 09:39:58 PM · #2 |
| does the polarizer have a color gradient? Or is it solid? |
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11/10/2005 10:01:14 PM · #3 |
Solid black
Originally posted by ladyhawk22:
does the polarizer have a color gradient? Or is it solid? |
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11/10/2005 10:04:14 PM · #4 |
Look through your viewfinder at a blue sky or a reflective surface like water or car window and you can see the changes as you turn it.
You can use the line to position it without having to look directly at the viewfinder. |
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11/10/2005 10:06:30 PM · #5 |
The filter should rotate when installed. That will enable you to adjust how much polarizer effect you want. If you turn it to see the most pronounced effect (darkest image, or most contrast in, say, a cloudy sky) then the least effect will be 90 degrees from that. The white line is to give you an arbitrary reference point.
Hope this helps.
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11/10/2005 10:21:41 PM · #6 |
Free roation is normal. The smoother the better. The white line is, as the man said, an arbitrary reference point. Here's how to use it:
Set the camera up on a tripod and rotate the polarizer for the effect you want. Note the position the white line is in relative to the horizon. Now rotate the camera to vertical/portrait orientation, usually 80 degrees leftward on most tripods. NOW rotate the polarizer 90 degrees leftward also, so the white line resturns to the same relationship to the horizon. Constant polarization for both shots.
To visualize what's really happening here, imagine you had a very large poalrizer mounted on a separate tripod in front of you, and that you looked through it without a camera and adjusted it for effect. Then you'd place another tripod, with camera, so it was shooting through the tripod, and the polarizer of course woudl remain unaffected no matter how much you twisted the camera left or right.
That's what the reference point is for; so you can orient the polarizer independently from the camera, more or less.
Robt. |
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11/10/2005 10:50:19 PM · #7 |
| Pointing the white line towards the sun will give you maximum darkening of the sky. Or point it straight up to reduce glare from non-metallic objects lit from above (this is the orientation that polarizing sunglasses have). |
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11/11/2005 12:38:05 AM · #8 |
Another question : I have a Sigma 18-125mm lens and have a 62mm polarising filter that fits it. The only trouble is that at wide angle I get some vignetting i.e. the corners of the image are dark, simply because the filter is deep enough so its just visible through the lens at wide angle. Is there a special slimline filter available to avoid this? Anyone have any other ideas?
BTW yes, it is the only filter fitted, I did originally screw it onto the UV filter that lives on my lens and had MAJOR vignetting with that combination. |
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11/11/2005 12:53:33 AM · #9 |
There ARE extra-slim polarizers, yes, and they are pricy. I'm not sure who's doign them best now, I'm out of that loop...
R. |
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11/13/2005 04:55:03 AM · #10 |
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11/13/2005 09:35:51 AM · #11 |
Everything you ever wanted to know about polarizers and digital cameras:
//dpfwiw.com/polarizer.htm
Message edited by author 2005-11-13 09:36:26. |
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