That's why you have to state your assumptions just changing the coc
assumption by that much takes the APS total DOF from .483 feet to .187
feet...
Herb Chong wrote:
some people would place the APS COC at 0.017 instead.
Herb....
----- Original Message ----- From: "P. J. Alling"
<[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, July 14, 2005 12:55 PM
Subject: Re: Theory of Equivalency
From F Calc.
This little comparison chart takes into account the differing rule of
thumb Circle of Confusion needed for APS and 35mm assuming an
equivalent AOV for 18mm and 28mm. I generated this using fcalc, I
could have done the math myself but this was easier...
Distance (feet) 3.0
Aperture 2.8
APS 35mm
----- -----
Lens 18mm 28mm
COC .0199 .025
Dof near (feet) 2.778 2.599
Dof far (feet) 3.261 3.555
Total Dof(feet) .483 .9599
Looks like under these assumptions the DOF for APS with the
equivalent AOV is about double.
--
When you're worried or in doubt,
Run in circles, (scream and shout).
