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Re: [OM] Medium and large format resolution

Subject: Re: [OM] Medium and large format resolution
From: "John Petrush" <jfp@xxxxxxx>
Date: Tue, 21 Jul 1998 23:20:52 -0400
The resolution of 35mm lenses, as measured in line pairs per millimetre, is
generally greater than their larger format counterparts for the same angle
of coverage.  As stated, the gain in photo sharpness is due to the fact that
the larger film size requires far less enlargement to get the same print
size.  I read an interesting article a while back about resolution.  Look at
(I can't believe I actually *found* it)  A facinating discussion and well
worth the read.

John P

Winsor Crosby <wincros@xxxxxxx> wrote:

>Something that I have been curious about for sometime is the resolution of
>larger format lenses. A number of list users have admitted to the use of
>non-Oly cameras, but only because Oly does not make equipment in the larger
>formats. I understand. ;-)
>I have never seen lens resolution tests for medium or large format lenses.
>Are they published? If so what kind of resolution would one expect from a
>pretty good lens. I would suspect that it would be substantially lower than
>a lens for an OM or one of its competitors, if for no other reason than the
>greater distance of lens from the film plane. Admittedly, it is less
>significant with a larger piece of film that does not have to be enlarged
>as much.
>I suppose that if a Zeiss lens on a Hasselblad could resolve half the
>number of lines per mm at the film plane as an Zuiko lens on an OM, you
>would see a net improvement in the resolution in the final photograph,
>aside from improvements in texture, gradation and finer grain.
>Is there something in the relative size of the lenses and the amount of
>film they are trying to cover that makes larger lenses, smaller lenses more
>difficult to build with great precision, or is that even a factor in
>today's technology.
>I did see a fairly large collection of industrial photos in black and white
>enlarged to 8 1/2 inches by 10 inches made with a Hasselblad and a Leica. I
>could not tell which camera took which photo.
>Any enlightenment?

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