This is a fun little optical formula. Does your EOS M need a super telephoto solution that doesn't weigh too much? Then a 600mm f/5.6 DO IS could be just the ticket.

Patent Publication No. 2015-215437

  • Published 2015.12.3
  • Filing date 2014.5.9
  • Focal length 585.00
  • F-number 5.74
  • Half angle (in degrees) 1.34
  • Image height 13.66
  • Overall length of the lens 299.25

This is probably Canon covering all their 600mm DO options.

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