corners are dark, lens shield? at DVinfo.net

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


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Old June 14th, 2004, 05:00 PM   #1
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corners are dark, lens shield?

I just checked out one of my school's spiff-tastic gl2's a few weeks ago to shoot a sporting event. When I dumped it to my computer, i noticed that the corners of the image were darker than a nice circle in the center. Is this because of my lens shield? I was shooting in the evening at my friend's tennis court with the overhead halogen lights turned on. Its not limited to that camera, because I was also using a GL1, and it had the very same problem. Any suggestions?
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Old June 14th, 2004, 05:19 PM   #2
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This is a normal attribute of the lens' design, known as edge fall-off. It will be more apparent under certain shooting conditions. We have a very long thread on this topic dating back nearly two years. But that's the bottom line.
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Old June 14th, 2004, 09:45 PM   #3
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I noticed the same effect when reviewing shots taken at twilight on a lake shore recently. Now that I know it is a lens attribute, I'll make allowances for it in the future. (Will try to avoid shooting at full zoom in low light.)

Here's the thread Ken was referring to:
http://www.dvinfo.net/conf/showthrea...&threadid=3430
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Old June 18th, 2004, 08:11 AM   #4
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I thought it was due to the iris opening too much. If you lower the shutter speed or film on manual this effect goes away.
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Old June 18th, 2004, 08:18 AM   #5
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That's correct.
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