Re: Digital Cameras

[Raphael Bustin <rafeb@channel1.com>]

On Tue, 6 Jul 1999, Robert Hildebrand wrote:

> While I was looking
> at the actual chip in the  back ,  I noticed that the chip looked to be about
> the size of 35 mm film + a millimeter or two.  The salesman said that  it only
> sampled from the center of the image.

None of the 35-mm SLR digicams has a sensor that's the
size of a 35 mm frame (24x36 mm.)  The size if the chip
is sometimes given in the camera spec, but you can also
guesstimate the size by the "focal length multiplier"
and/or the focal length of the so-called normal lens.

For example, if the normal lens is 14 mm, then you can
guess that the CCD array has a diagonal of around 14 mm.
That would be an equivalent to a focal-length-multiplier
of 50/14= 3.6.


rafe b.

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