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My medium format digital journey - DoF and diffraction

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Article Index
My medium format digital journey
raw images for download
Where do I stand now
The experience
Color Profiles
Resolution Tests
Real World Samples
Color rendition
Dynamic Range
Moiré & aliasing
DoF and diffraction
More real world images
Three format comparison
Diffractio series
The lenses
The Bad News
Capture One or LR 4.4
Some comments on Phase One business model
The Ultimate Platform?
All Pages

DoF and diffraction

I made a series of images of a fountain at the castle with different apertures. Focus was in all cases on the head in the fountain statue. 

Here the ledt image is Sony Alpha 900 at f/8, center Hasselblad at f/32 and Hasselblad at f/11. Here we see decent sharpness in both left image from foreground to background, with the yellow flower being a bit odd in sharpness.

The second crop is Sony Alpha 99 on top, followed by Hasselblad at f/32 and Hasselblad at f/11. We see that the head, which is supposed to have focus is much sharper in the f/11 image than in the f/32 image. Stopping down increases diffraction and larger formats are no way immune to it. 

In images requiring a lot of DoF larger formats may not show a true advantage, as they use longer focal lengths to keep field of view and need more stopping down. Stopping down excessively increases diffraction.  

Last Updated on Thursday, 08 August 2013 12:38  


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