Aperture larger than F/2.8 possible in wide angle? - Feature Requests - CHDK Forum

Aperture larger than F/2.8 possible in wide angle?

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Offline wap4

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Aperture larger than F/2.8 possible in wide angle?
« on: 28 / February / 2008, 10:53:10 »
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 The F-number is defined as the ratio between focal lengh and aperture diameter,AFAIK.
In my A720IS, I can have F/4.8 at max zoom,i.e. 35mm focal length. So shouldn't I get larger than F/2.8
aperture in full wide angle,i.e. 6mm focal length? ( 35/4.8 is much more than 6/2.8 ) Please correct me if
I'm wrong.I'm willing to accept larger aperture even at the cost of shallow DOF & more purple fringing!   


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Offline jetzt

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  • [A710IS,(SD200)]
Re: Aperture larger than F/2.8 possible in wide angle?
« Reply #1 on: 29 / February / 2008, 09:06:04 »
I think it is fully open at F2.8 also it isn't F2.8 in realyty, what I mean is that the aperture is fully open at "normal" F2.8.
So opening if further could work, but only with a big drill. :haha

Re: Aperture larger than F/2.8 possible in wide angle?
« Reply #2 on: 29 / February / 2008, 13:25:57 »
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« Last Edit: 22 / April / 2008, 13:00:19 by Barney Fife »
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