Patent: Canon EF 400 f/4 DO IS

A patent for a new Canon EF 400 f/4 DO IS has appeared. The current lens has been around since December, 2001 and I think it’s a gem in the Canon lineup.

We’ve seen a lot of DO patents over the years, but no DO lens has been announced since June, 2004 when the EF 70-300 f/4.5-5.6 DO IS came to market.

Canon EF 400 f/4 DO IS

Canon EF 400 f/4 DO IS

  • Patent Publication No. 2014-109700
    • Publication date 2014.6.12
    • Filing date 2012.12.3
  • Example 1
    • Focal length f = 392.00-381.59-332.99mm
    • Fno.
    • Half angle ω = 3.16-3.10-2.81 °
    • Image height Y = 21.64mm
    • The overall length of the lens 292.02mm
    • BF 105.64mm

Source: [EG]Canon EF 400 f/4 DO IS at B&H Photo

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