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Canon GL Series DV Camcorders
Canon GL2, GL1 and PAL versions XM2, XM1.


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Old October 13th, 2002, 11:49 PM   #1
limnz0110
 
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CCD Size & Pixel Question

I'm interesting to buy XM2 and here is my question.
Canon GL2(XM2) has 470,000 Pixel ,Sony TRV 950 690,000 and Pansonic MX5000 has 80,000.

Is this mean Panasonic has better CCD than Canon?
I know Panasonic has 1/6", Sony has 1/4.7" and canon has 1/4" CCD.
So what's the difference about the size and the Pixel and how does it affect the quality of Picture?
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Old October 14th, 2002, 01:14 AM   #2
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Usually, the larger the CCD/s, the lower the lux; usually, the more CCD pixels, the higher the lux. So, the GL2 probably needs the least light whereas the MX5000 needs the most. Picture quality? I think they're all right up there. You just have to pick the one that suits your needs best.
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Old October 14th, 2002, 07:17 AM   #3
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Frank's replay is correct. Excluding the optics, slight differences in CCD layout/technology togheter with the signal processing can make some extra difference on "picture quality"
Small pixels (large number and/or small CCD) reduce sensitivity due to the reduced fill factor. In order to avoid optical aliasing (moire, edge business..) an infinite number(at least higher than the lens can resolve) of pixels would be ideal. Optical antialiasing filters, reduced lens resolutions, and pixel shift techniques lower these artifacts.
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Old October 15th, 2002, 08:41 PM   #4
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Also, in dual mode (still and video) camcorders often pixels used for higher resolution stills are not used for imaging in video modes.

And camcorders with electronic image stabilization 'waste' a substantial number of pixels in the EIS process.
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Old October 16th, 2002, 03:42 AM   #5
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Yes Don, and "waisting" is not the only potential resolution drawback with EIS. Even if the reduced pixelcount is still OK for DV resolutions, and the CCD readout is perfectly compensating the (moving) picture on the CCD, resulting in perfectly stable image, the motion blurr effects still reduce resolution. Often, in order to reduce this effect, the exposuretime is reduced when using EIS. This again reduces the low light performance under this condition.
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