[LRflex] Re: Interesting info for digitographers
- From: Colin Howarth <colin@xxxxxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Wed, 9 Nov 2005 10:09:54 +0100
> Date: Tue, 08 Nov 2005 19:27:43 +0100
> From: Douglas Sharp <douglas.sharp@xxxxxx>
> Subject: [LRflex] Interesting info for digitographers
>
> In the latest issue of ColorFoto (Germany) there's an interesting
> article about the limitations of digital cameras at certain lens
> apertures.
> It's all to do with refraction and pixel sizes, Airy disk size or
> Fraunhofer circles of diffraction - the main article is pretty much
> physics/optical theory but the list of cameras and limiting
> apertures is
> interesting.
>
> What it boils down to is - it's not worth stopping down to get a
> sharper
> image any further than the apertures shown below, it just won't
> increase
> sharpness, in fact it will get unsharp.
> (NOT DOF, that, of course, will increase)
>
> Camera/aperture
> Canon EOS 1Ds Mk II 11.8
> Canon EOS 1D Mk II 13.4
> Nikon D70 12.9
> Fujifilm S3 Pro 12.5
> Canon EOS 20 D 10.6
> Sigma SD10 15.0
> 4/3 cameras 9.0
>
> And it gets worse for compacts.
>
> It finally explains why my macro shots with f16 were not as pin-
> sharp as
> those with f8.
> Douglas
I thought maximum sharpness was at around f/8 (or even f/5.6 for some
Leica lenses) anyway, because of refraction?
colin
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