The pages are there, but the URL has changed to:
http://medfmt.8k.com/mf/lenslpm.html
http://medfmt.8k.com/mf/limits.html
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Original Message:
-----------------
From: Brian Swale bj@xxxxxxxxxxxxxxx
Date: Tue, 24 Dec 2002 11:22:45 +1300
To: joegwinn@xxxxxxxxx, olympus@xxxxxxxxxxxxxxx
Subject: [OM] Film and lens resolution (was Re: Dipping our Toe Into
Digital (LF lenses))
Hi folks,
Joe Gwinn wrote
> We are somewhat going in circles here. The reason that all photgraphic
lenses
> seem to have resolution within a factor of two of 50 line pairs per
millimeter
> (100 pixels per millimeter) is that this is more or less the resolution
of film
> of reasonable sensitivity (ASA 100 or greater), so the lenses are
designed to
> that resolution.
>
> Whatever the size of the film, 35mm, 6x6, 4x5, 8x10, the film resolution
is the
> same, so all lenses will have more or less the same on-film resolution,
with the
> more expensive lenses being better, and the less expensive lenses being
worse.
> The limits, from the websites mentioned below, seem to range from 100
line pairs
> to 25 line pairs per millimeter.
In my opinion, it's not reasonable to generalise so much.
With lenses there are very measurable and significant differences.
For film, there are also significant differences between emulsions. Go to
http://www.google.com and do a search for " film resolution limits "
without
the quotes.
Near the top of the search you will find a couple of Robert Monaghan's
pages.
You will need to download the cached versions as the original sites have
exceeded their paid-up download limits and have all access denied except
for the author.
The file names are "lenslpm.html" and "limits.html"
They are very instructive as to what film, lenses and systems can deliver.
If anyone can't get these files give me a call and I can e-mail copies.
Brian
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