Archived posting to the Leica Users Group, 1997/05/19

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Subject: Re: 35mm lenses compared?(tech/optics)
From: Jim Brick <jim@brick.org>
Date: Mon, 19 May 1997 14:37:46 -0700

At 11:49 AM 5/19/97 -0600, you wrote:
>LUGsters,
>...
>The face just melts into a smooth, non-literal form, leaving the
>background sharp as nails. I don't know how to calculate this, but the
>foreground DOF is much smaller than the background DOF at 1.4. With the
>1.4/35 I can really blow the foreground to bokeh hell, as compared to the
>background. Anyone know why?
>
>Anyway, as to someone's comments about the S'lux v. the S'cron 35s at
>maximum aperture: I think what you're seeing as far as differing sharpness
>is DOF.
>
>Other than that, I have nothing to write.
>
>,/8^j
>

For anybody that is interested, there is a great dissertation on DOF at the
following URL:

http://fox.nstn.ca/~hmmerk/HMbook14.html

Jim