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[OM] Re: Apertures, where is f22 ?

Subject: [OM] Re: Apertures, where is f22 ?
From: Dan Mitchell <danmitchell@xxxxxxxx>
Date: Wed, 08 Jun 2005 08:30:10 -0600
Moose wrote:
> [elucidation snipped]

  I was just thinking about this stuff, and realised that with digitals, 
there's yet another thing to take into account.

  Say you have a 1mp digital camera with a 50mm lens on it. (doesn't 
really matter if that's pre or post multiplication factor). Take a shot.

  Now take the same shot with the same lens, this time mounted on a 4mp 
digital camera.

  Second shot has twice as many pixels in each direction, so you could 
crop out the middle half of the image and get a picture equal in quality 
to the first image, but with "twice the focal length".

  So, in some ways, increased pixel count also gives you a lens 
multiplication factor. It's only relative, though.

  -- dan

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