Why is my aperture changing when zooming? at DVinfo.net

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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 August 5th, 2007, 06:41 PM   #1
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Join Date: Sep 2004
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Why is my aperture changing when zooming?

I don't know if this is normal or not or if there is any way to combat it with the A1. When I am completely zoomed out, I can open up the aperture all the way to 1.6 in manual mode. But as soon as I start zooming in, the aperture also starts closing up and the aperture number begin to slowly increase. Why won't it just stay where its at? I am trying to keep it wide open for my 35mm adapter, which I need to zoom in to.
Thanks in advance.
Taj
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Old August 5th, 2007, 06:44 PM   #2
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Copy/paste of my answer last time this issue was brought up:

The XH-A1 lens is not a constant aperture lens, which means maximum aperture changes with focal length. The lens is capable of f/1.6 at wide angle, but only f/3.5 at full telephoto. Annoying yes, but that's lens physics - a constant f/1.6 lens would be HUGE.

I've only had my A1 for 2 day, limited experience. But I think the solution is to predict the max. focal length required for the shot, note the maximum aperture associated with that focal length and manually selecting it for use through the entire scene.
Rene Roslev is offline   Reply With Quote
Old August 5th, 2007, 06:56 PM   #3
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Thank you Rene!!!! that explains it all for me.
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