http://www.luminous-landscape.com/reviews/shootout.shtml
This is fishy to me... Only because the mathematics of it doesn't work...
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, 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
I currently don't know of any lenses in 35mm format world that resolves
this much. Also, as velvia has a 125 line/mm resolution limit, we know
that the Pentax lens is not using up the full resolution capabilities of
the film.
Therefore, we must conclude since the film-size is 4.5 times bigger,
that between the digital CMOS, and the lens on the Canon, since the film
of choice is not the limiting factor, then that means the Canon lens is
4.5 times sharper then the Pentax lens? Or the combination of the CMOS
+ Canon lens is sharper?? No way. Not possible, because the Canon lens
cannot resolve that much!!
This was the mathematical reasoning behind the 4/3's system! Something
is very fishy with this test; as there is really no way that an 11.1MP
camera will beat a decent MF camera (and at 6x7cm no less!!) NO WAY.
The 35mm lens is the limiting agent here. There's no doubt about it.
The CMOS can be made finer then film; but the lens in front of it won't
resolve to it.
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... Someone nominate a lens that will do this that is currently
in the Nikon mount line...
Albert
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