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Panasonic AVCCAM Camcorders
AVCHD for pro applications: AG-AC160, AC130 and other AVCCAM gear.

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Old January 28th, 2010, 02:36 PM   #16
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Join Date: Apr 2009
Location: San Diego, CA
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Originally Posted by Chris Soucy View Post
The aperture setting is basically a percentage of the available light. As the lens is zoomed in and loses light, that fixed aperture percentage remains constant, so less light makes it through to the sensor.

I'd second Tom' reply to your post and also note that you can test this behavior out on the camera by locking the shutter speed and gain. Then aim at a uniformly lit target and zoom. If the iris is set to "open," you will see the luminance meter (the percentage displayed at the center of the lcd display) change, if the iris is set to f/2.8 or higher, it will remain constant or only change very sightly. I just did this on my HMC40 and it performs as I described.
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Old January 28th, 2010, 03:05 PM   #17
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Location: Toronto, Ontario, Canada
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Originally Posted by Tom Hardwick View Post
You're right in what you say Guy, but I think you mean maximum when you write minimum (above).
Yes, sorry my goof!
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