Aperture 2.8? - General Help and Assistance on using CHDK stable releases - CHDK Forum
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Aperture 2.8?

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Offline PowerA620

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Aperture 2.8?
« on: 08 / September / 2009, 11:52:23 »
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I am newbie to photography. I own Canon A620. I need an information reagarding Aperture setting.

Canon A620 sets aperture value to f/4.0 at full optical zoom. If i set override aperture setting to f/2.8 in CHDK. Will this make a large lens opening and change in DOF or it will give the same results as f/4.0.

Please help. ;
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Offline Microfunguy

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Re: Aperture 2.8?
« Reply #1 on: 08 / September / 2009, 13:37:48 »
Quote from: PowerA620 on 08 / September / 2009, 11:52:23
If i set override aperture setting to f/2.8 in CHDK. Will this make a large lens opening and change in DOF or it will give the same results as f/4.0.

Exactly the same as f/4.0, or more pecisely f/4.1.

The aperture is already fully open.

The f-number is defined by size of entrance pupil and its distance from sensor when focused to infinity.

That  changes with zoom setting.


David
« Last Edit: 08 / September / 2009, 13:46:36 by Microfunguy »
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