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Sony HVR-A1 and HDR-HC Series
Sony's latest single-CMOS additions to their HDV camcorder line.


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Old October 11th, 2007, 02:39 PM   #1
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UV lens infront of polarizer?

I just got my lenses in - B+W stuff, very nice quality, however, i'm curious...currently for the hell of it, I put the polarizer on first then the UV lens then the WA lens.

I remember reading that putting a UV lens sandwiched between a polarizer and WA lens is pretty much useless....

why is this?


so is it a NO-NO to have the polarizer then the UV then the WA lens? is it bad at all?

thanks!
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Old October 11th, 2007, 04:28 PM   #2
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It just produces more glare and takes more light. In a way any glass filter is a UV filter, so you don't need a dedicated UV filter when you have other filters on.
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Old October 11th, 2007, 05:24 PM   #3
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Hrm, I thought that the polarizer was good for just doing that....and was NOT good for being a UV filter or Haze type filter.

How does a UV in front of a polarizer create more glare and take more light?
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Old October 11th, 2007, 05:52 PM   #4
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more glass surfaces=more light absorbed as it passes through, and more planes to reflect glare as light bounces off
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Old October 11th, 2007, 06:20 PM   #5
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Quote:
Originally Posted by Jason Ladera View Post
Hrm, I thought that the polarizer was good for just doing that....and was NOT good for being a UV filter
Glass absorbs UV light. This is why you don't get sunburn when you drive a car on a sunny day with windows up. Specially produced glass called quartz passes UV through.
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Old October 11th, 2007, 06:23 PM   #6
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dont forget the risk of vignetting of the 2nd element away from the camera lens. you can always zoom in to eliminate the vignetting but then you lose the wide angle ;)
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Old October 11th, 2007, 08:26 PM   #7
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Hrm....

wait so its not sounding like this is a bad thing.

or am I completely misunderstanding all of this.


having a UV in front of a polarzier (by the way its the B+W Kaesemann polarizer)

isn't really that bad of a thing.
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Old October 12th, 2007, 02:57 PM   #8
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Why would you need a UV filter? Besides a slight (max 1 stop) transmission loss through the lens, the sensor itself is, unlike film material not sensitive to the UV spectrum. A polarizer will do the job and is at least as good as a UV filter for reducing haze when rotated in the optimal angle.
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Old October 12th, 2007, 03:57 PM   #9
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Okay, I understand now.
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