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Patent: 600 f/4 DO IS & 400 f/2.8 DO IS

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Canon Rumors:
Corrected the errors in the original post.

Daniel Flather:
The 600 v2.0 is still not on the sales floor as of today. 

GMCPhotographics:
I think if Canon could find a way to keep their lens purchase price at a more reasonable level and can correct the lack of contrast and lower sharpness that DO tech causes, then I think Canon would have a winner on their hands.

A 400m f2.8 DO that's 1/3 of the weight but carries the same IQ that the L version offers can only be good.

RLPhoto:
With all these DO patents, We can expect an major unveiling of an entire new Canon DO line-up sometime in the future. Its would be a nice to have an more affordable versions of the larger longer lenses 300mms and up.

FarQinell:
I wonder why the "design" focal length of BOTH are less rather than slightly higher than nominal?

They had better do a better job on these lenses than they did on the 400/4.

Maybe Canon have gone as far as they can with reducing weights of conventional super telephotos and any further weight reductions will have to be by way of DO. Risky expensive strategy!

Note to Canon:
Produce a conventional design 500/5.6 prime coming in at under 5000USD and 2.5kg. It would be a best seller for you!

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