----- Original Message -----
From: "Albert" <olympus@xxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Monday, January 27, 2003 10:42 AM
Subject: Re: [OM] Medium Format vs. Digital
In http://www.luminous-landscape.com/reviews/shootout.shtml I wish to see
the drum scan and the other detail pics with higher resolution, may be
factor 2 or 3 or original drum scan resolution.
> Ok, let me assume that the Pentax's lens resolves at 70 lines/mm. This
> is a fairly conservative number, and so I've picked it. Most Zeiss
> lenses etc.. will resolve 80+ lines, but we'll go with 70 lines.
>
> 6x7 yields an effective area of 56mm x 69.5mm = 3892mm^2
> 35mm yields an effective area of 24mm x 36mm = 864mm^2
>
> That means there is 4.50 more surface area on the 6x7 then the 35mm.
>
> Ok, let's do some math here...
>
> Canon 1Ds = 11.1 megapixels. OK.
>
> If we take a pixel as a crossroad of 2 lines,
You need two pixels to resolve 2 lines.
> we would then be able to
> effectively calculate how much resolution a lens in 35mm format would
> have to yield, to take advantage of the 11.1 megapixel sensor..
>
> sq-rt (11,100,000 / 864) = 113 lines / mm
Gives 57 lines/mm.
> The film is not the limiting reagent, the lens is... The math becomes
> more rediculous with the Kodak 14 Megapixel camera... A lens would have
> to resolve to 127 lines/mm to equal "squeeze" out 14 megapixels worth of
> quality...
Gives 64 lpmm.
Peter
--
who likes his MF Leica = M 7 and put money aside for a consumer 1Dsss in 1-2
years.
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