Canon 85 mm f/1.8



This is a good fixed focal length lens; star testing shows that a good behaviour can be obtained with a couple of stopping down. Testing was made on a clear and cold night of December 2010, with automatic tracking of my Kenko NES mount. Exposures and ISO were selected to maintain a constant nominal exposure, except the two higher apertures.
The results show that a good star shape is obtained at f/4.
Thanks to Alessandro Gambaro for testing together his objective.


Aperture testing with Canon EOS 5D (full frame)
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Focus testing with Canon EOS 5D (full frame)
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Aperture testing with Canon EOS 40D (APS-C)
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