A new patent for a Canon 400mm F/4 DO IS has surfaced, leading to speculation that Canon could possibly be gearing up to replace the current model.


The current Canon 400mm F/4 DO IS was originally released to the world in 2001, so and update to the lens would not be out of the realm of possibility. Especially when you consider that Canon has been releasing updates to a lot of their long telephoto lenses lately.

Its bigger brother, the Canon 400mm F/2.8L is an insanely expensive $12,000 lens. The current 400mm F/4, while not exactly cheap, does offer good savings over the F/2.8 model coming in at “only” $6,500.

Honestly, I still think that Canon should focus their attention to more attainable lenses in their lineup that need upgrading. Yes, a new 400mm F/4 would be nice for the thousands of photographers that can afford one, but wouldn’t an updated 135mm F/2 (just for example) be a bigger money maker for the hundred of thousands – maybe even millions – of photographers that could afford one?

Anyways, back on topic. The newly discovered patent details can be found below for those that are interested.


  • 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


What are your thoughts on this? Obviously, just because there is a patent doesn’t mean Canon is working on an update, but assuming they are, are you at all interested in this?

[via Canon Rumors]