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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 09 Mar 2014 (Sunday) 20:55
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ISO and picture sharpness - Canon EOS 70D

 
Brian5757
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Mar 09, 2014 20:55 |  #1

When using a small aperture of f16 I am finding some things are not sharp in focus that should be sharp in focus. I was using ISO 400 at the time so I'm wondering if this could be the reason.
I don't think it would be camera shake as the shutter speed was above 1/125 sec and the object was not moving. The object was at a reasonable distance from the camera. I was using a single center focus point.


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jt354
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Location: Michigan
     
Mar 09, 2014 21:06 |  #2

ISO 400 on the 70D should cause no noticeable softening of the image, even if noise reduction were enabled. It's more likely that you're just observing the effects of diffraction due to the stopped-down aperture. Not being a physics major, I won't attempt to explain this property of light, but as you stop down beyond f/11 or so on an APS-C camera the results will gradually begin to appear "softer." Hard to tell without seeing image samples


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xarqi
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Mar 09, 2014 21:14 |  #3

Yup, sounds like diffraction softening to me. Test for yourself by shooting the same scene at various apertures.




  
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seanp3
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Mar 09, 2014 21:18 as a reply to  @ xarqi's post |  #4

What was your focal length?




  
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ISO and picture sharpness - Canon EOS 70D
FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
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