Wednesday, 29 February 2012


(Canon EOS 60D, Tamron SP90mm Macro f/22)
One of the chrysanthemums my daughter gave my wife for her birthday.  I decided to experiment with macro photos and the effects of diffraction. Diffraction causes blurring of an image when a small aperture is used. I wanted to see when the effect becomes particularly noticeable. The main photo above looks sharp and clean but close inspection shows blurring of the fine detail. The 3 actual size (uncropped) photos below show diffraction occurring. The image taken at f8 is sharp, f16 less so and f32 obviously blurred. All 3 images were taken with the pre-focussed camera on a tripod and with a remote release to avoid any camera shake. Click the images to see them enlarged.
Centre of photo at f8

Centre of photo at f16

Centre of photo at f32

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