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Canon XH Series HDV Camcorders
Canon XH G1S / G1 (with SDI), Canon XH A1S / A1 (without SDI).

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Old September 29th, 2008, 11:29 AM   #1
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What´s better? Optical Filters pre or post proccesing?

Hi all,
I have this dude, I know polarizing filters do a great job, but I like to explain something. I recorded a leopard in zoo protected by a heavy methacrylate glass and the transparency and contrast was really terrible due to adverse ligth. I thought that was a lost file. Anyway, at home I play a litlle with that file in Sony Vegas Video, using curves, profiles, contrast, etc. and the final result was pretty good, usable and now the file is in a family video.
Filmed with my HV 30, not a perfect focus, but enough to see the effect.
So, if you use a polarizer, what is easier?, reducing contrast and saturation got with the optical filter or raising up leves by software? What do you prefer?

Thanks
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Old September 29th, 2008, 01:11 PM   #2
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I would use a polarizer if you have one.
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Old September 29th, 2008, 02:58 PM   #3
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Thanks, Bill. By the way, I have one Kenko pro polarizer 72mm from my photography gear, circular polarizer.
But I am asking the following, does the light rays go the same way to one CCD/CMOS captor from a DSLR camera that to three independent CCD , R, G, B?
A bit confused this way.

Thanks again.
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Old September 29th, 2008, 03:33 PM   #4
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The answer appears to be no, based upon what I know. There's anecdotal evidence insofar as you need to use a circular polarizer with a DSLR and you can use a linear polarizer on the A1.

Rather than a bunch of us giving you dribs and drabs about the differences between the two, you'd probably be better served by checking out these links.

Digital single-lens reflex camera - Wikipedia
3 CCD Structure - Wikipedia

To answer your original question, it's generally best to get it right through the lens and then use tools in post to refine the image.
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Old September 29th, 2008, 04:52 PM   #5
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You can use the circular polarizer with a video camera. It's just that there's no advantage over a linear one.
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Old September 30th, 2008, 03:27 AM   #6
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Thanks to all. I have made a little test with the Kenko polarizer attached to the Canon XH A1 and everything seems to be ok.

Cheers
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