Olympus-OM
[Top] [All Lists]

[OM] DOF and diffraction redux - again [was Focus Accuracy Test - Oh wha

Subject: [OM] DOF and diffraction redux - again [was Focus Accuracy Test - Oh what misery we bring upon ourselves]
From: Moose <olymoose@xxxxxxxxx>
Date: Sat, 14 Aug 2010 16:27:47 -0700
  Hey Chuck, some more thoughts on empirical results vs. calculations.

You have for some time contended the 5D is diffraction limited at f11. I don't 
know the source of your calculations. The 
"Diffraction Limited Aperture Estimator" on the link somebody posted a bit ago, 
says it is f16, which agrees with my 
experience. 
<http://www.cambridgeincolour.com/tutorials/digital-camera-sensor-size.htm>

Obviously, there are calculations, and then there are calculations.

On the same page, the "Depth of Field Equivalents" calculator says* the 
equivalent aperture for the G11 is f4. I feel 
it's closer to f5.6, but haven't done any controlled testing. it may, however, 
be an example of something like this, 
"Even though diffraction softening affects all systems equally at the same DOF, 
the system that began with more detail 
will retain more detail " from: 
<http://www.josephjamesphotography.com/equivalence/index.htm>
,where the lower level of pixel level detail means diffraction effects aren't 
visible until stopped down further.

Optimum Aperture Moose

*Interpolated, as they don't have the exact sensor size as a choice.


-- 
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/

<Prev in Thread] Current Thread [Next in Thread>
Sponsored by Tako
Impressum | Datenschutz