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Monday, December 26, 2016

New Canon Patent - 135mm f/2 Lens With Apodization Filters

Fujifilm XF 56mm f/1.2 APD lens

The Japanese photography blog Egami discovered a new Canon patent for a 135mm f/2 lens design with two apodization filters.

The literal translation for Apodization is 'removing the foot'. In the jargon of optical engineers, it's purpose is to remove Airy disks caused by diffraction around an intensity peak, enhancing focus on the subject.

This is not a new optical invention. Canon has it on some EF lenses, so does other manufacturers like Fuji. It announced the XF 56mm f/1.2 APD in 2014.  This is another improvement to Canon's previous patents.

Patent Details (Google Translated)  

  • Patent Publication No. 2016-218444
  • Published 2016.12.22
  • Submitted 2015.5.20
  • Focus distance 130.98
  • F-number 2.06
  • AOV 9.38
  • Like high 21.64
  • Overall length of the lens 159.05
  • BF 53.99
  • Good blurred image at all angles, even if there is a vignetting

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