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Archive 2013 · Canon EF 400mm f/4 DO IS patent released
  
 
Fred Miranda
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p.1 #1 · Canon EF 400mm f/4 DO IS patent released


New Canon EF 400mm f/4 DO IS patent released
It's been more than a decade since Canon released a "Diffractive Optics" super telephoto lens.

However, it does not seem that Canon gave up on this technology as new EF 400mm f/4 DO IS patents keep emerging.

Here is the latest one via Egami blog.







Interpretation and self-description of the patent literature






Patent: 400mm f / 4 DOE




Apr 15, 2013 at 03:35 PM
Andri Elfars
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p.1 #2 · Canon EF 400mm f/4 DO IS patent released


Thanks for the update I was thinking about this lens yesterday and the 400mm 2.8 II canon outperforms the old 400 green DO. It will be interesting to see a new lens. I would like to read more about the science of the design.


Apr 15, 2013 at 04:36 PM
Edward Castro
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p.1 #3 · Canon EF 400mm f/4 DO IS patent released


I'd hate to see the price for a new DO lens, OUCH!


Apr 15, 2013 at 05:02 PM
phuang3
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p.1 #4 · Canon EF 400mm f/4 DO IS patent released


This lens is not as poplar as the 400/5.6L. I was hoping Canon would release an IS version of 400/5.6L or renew the versatile 100-400/5.6L


Apr 24, 2013 at 06:20 AM
 

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jjoejr
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p.1 #5 · Canon EF 400mm f/4 DO IS patent released


Just thinkin. A canon 500mm 5.6 lense with no IS. Wouldn't that be a bad azz lightweight BIF lense?


Apr 24, 2013 at 11:50 AM
abqnmusa
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p.1 #6 · Canon EF 400mm f/4 DO IS patent released


A hand holdable 500mm F5.6 would be ideal.

Canon offers no affordable option to better the 400mm F5.6 reach & IQ.
Sigma may be the hope for 500mm F5.6 option








Apr 24, 2013 at 06:22 PM
Eyvind Ness
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p.1 #7 · Canon EF 400mm f/4 DO IS patent released


jjoejr wrote:
Just thinkin. A canon 500mm 5.6 lense with no IS. Wouldn't that be a bad azz lightweight BIF lense?


The Sigma 500 f4.5 is pretty close to your spec:

http://www.sigma-photo.co.jp/english/lens/tele/500_45/#/specification

3,1kg, no IS. I used it for a year before upgrading to the Canon 600 f4 IS mkII. The Sigma is sharp when focused accurately, but lack of IS/OS is a killer, at least with my preference for hand-held shooting.



Apr 24, 2013 at 06:30 PM





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