Re: Warning of major NHS IT overspend

[Brian Morrison <[EMAIL PROTECTED]>]

On Tue, 02 Nov 2004 16:46:44 +0000 in [EMAIL PROTECTED]
Brian Gladman <[EMAIL PROTECTED]> wrote:

>  High end digital compact cameras do not have such small sensors. The
>  one I use has a 16mm square sensor with 8 Mpixels.  This works out at
>  about 1/3 the area of a 35mm frame and provides a resolution of about
>  170 pixels/mm.
> 
>  I suspect that this is a significantly higher than the resolution of
>  the (mostly zoom) lenses that are typically fitted on such cameras.

About 15 years or so ago the typical resolution obtainable on film of
the period with standard camera lenses and independent manufacturers'
zoom lenses was between 100 and 150 line pairs per mm. Some did a little
better, but not a great deal. I don't expect the state of the art for
the consumer market has improved a lot in that time.

Such a resolution was adequate for prints of up to 10x8 inches easily. A
2Mpixel digital camera is approximately equivalent at the same print
size.

-- 

Brian Morrison

bdm at fenrir dot org dot uk

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