http://home.globalcrossing.net/~zilch0/tools.htm will tell you more than you
want to know Andrew, and avoid a repeat of an exchange hereabouts just
before your return, in which a few of us tried vainly to argue that black is
white (without defining in advance whether we were talking of the negative
or the print) so to speak.
--
Piers
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
Of Andrew Dacey
Sent: 28 July 2005 17:28
To: Olympus List
Subject: [OM] DoF conversion from 35mm to digi equivalant
One of the things I'm trying to wrap my head around for the switch to
digital is how the DoF changes. I know with a smaller sensor you get a
greater DoF for the same field of view (much like you get a smaller DoF with
larger formats).
But, I'm wondering how one can quickly figure out what aperture you should
select to get the equivalent DoF with the smaller sensor?
Most DSLR's have a multiplier of 1.5x, that's awfully close to the 1-stop
magic number of 1.4 (well okay square root of 2 but you know what I mean).
Or, with the 4/3 system it's a 2x multiplier. What I'm wondering is can you
simply assume that to get the same DoF you'd need to open up 1 stop for APS
sized sensor and 2 stops for 4/3?
For instance, say I have 2 Zuikos (had to keep this on topic somehow), a
50/1.4 and a 100/2.8. I could mount the 100/2.8 on an OM and the
50/1.4 on an E-1 to get the same FOV. Would the 50 at 1.4 give me the same
DoF as the 100 at 2.8?
If I'm right, it seems like a nice easy way to quickly figure out what the
DoF would be if you're used to thinking in 35mm terms. If I'm wrong, is
there a quick formula to use?
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