Article updated— Brand-new Blur

I’ve updated my Brand-new Blur article to (unfortunately) include an example of optical misalignment with the Canon EF 85mm f/1.8. I’ll be sending it in to Canon service. Once fixed, I expect the 85mm f/1.8 to be an ideal performer on the Canon EOS 1D Mark III. Normally I would exchange the lens, but I didn’t get around to using it until long after I had purchased it.

  
Canon EF 85mm f/1.8 optical misalignment @ f/1.8, left edge / right edge
(tested on Canon EOS 1D Mark III)

Misalignment problems are even more troublesome on full-frame cameras; this example is from the Canon EOS 1D Mark III, which uses a 28.7 X 18.7mm sensor, covering the central 64% of a 36mm X 24mm “full frame” camera.