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Author Topic: Patent: EF 400 f/4 DO IS II  (Read 7667 times)

MSP

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Re: Patent: EF 400 f/4 DO IS II
« Reply #15 on: April 15, 2013, 01:19:41 AM »
Around $2k more than the current model sounds about right. I think there's a solid market for an updated version with the new 3 mode IS system IF they can improve the IQ, especially the bokeh. The images I've seen from the 400 DO are crisp where they're focused but have a strange, choppy bokeh, kind like the OOF areas when using a 2x extender. A 4lb, 400mm f4 with big white IQ and updated IS would be a sweet lens for a traveling sports/wildlife photographer.
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Re: Patent: EF 400 f/4 DO IS II
« Reply #15 on: April 15, 2013, 01:19:41 AM »

Plainsman

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Re: Patent: EF 400 f/4 DO IS II
« Reply #16 on: April 15, 2013, 03:26:35 AM »
Why not a scaled down version of the superlative 300/2.8 II with a weight somewhat less due to 100mm aperture as against 107mm?

The fact that this is another DO patent somehow confirms to me anyway that a new 400/4 is a long way off - maybe never.

Also of course it would impinge on sales of the 300/2.8 It's all to all to do with marketing - not what the lens punter actually desires!!
« Last Edit: April 15, 2013, 03:54:15 AM by Plainsman »

Q8-MC

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Re: Patent: EF 400 f/4 DO IS II
« Reply #17 on: April 15, 2013, 03:49:02 AM »
Sorry guys. what does mean DO? and what the difference between DO and IS?

BrandonKing96

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Re: Patent: EF 400 f/4 DO IS II
« Reply #18 on: April 15, 2013, 04:20:21 AM »
Sorry guys. what does mean DO? and what the difference between DO and IS?
DO is Diffractive Optics, and does not replace IS :) allows the use of extremely low dispersion glass, which also has a low refractive index. The low dispersion reduces color fringes.
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ajf

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Re: Patent: EF 400 f/4 DO IS II
« Reply #19 on: April 15, 2013, 04:55:10 AM »
I have been unable to find "Patent Publication No. 2013-64858".  It doesn't seem to be a US application - US2013064858 relates to a polysaccharide for modulating immune response.  Can you tell me where it was published?

Q8-MC

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Re: Patent: EF 400 f/4 DO IS II
« Reply #20 on: April 15, 2013, 04:56:32 AM »
Sorry guys. what does mean DO? and what the difference between DO and IS?
DO is Diffractive Optics, and does not replace IS :) allows the use of extremely low dispersion glass, which also has a low refractive index. The low dispersion reduces color fringes.


Big  thaaanks bro

thebowtie

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Re: Patent: EF 400 f/4 DO IS II
« Reply #21 on: April 15, 2013, 06:20:48 AM »
I have been unable to find "Patent Publication No. 2013-64858".  It doesn't seem to be a US application - US2013064858 relates to a polysaccharide for modulating immune response.  Can you tell me where it was published?
I would say Japan (considering Canon is a Japanese company - they would file all initial Patent applications in Japan, and use world-wide agreements on IP protection whilst they filed patents elsewhere)
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Re: Patent: EF 400 f/4 DO IS II
« Reply #21 on: April 15, 2013, 06:20:48 AM »

ajf

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Re: Patent: EF 400 f/4 DO IS II
« Reply #22 on: April 15, 2013, 09:42:22 AM »
I have been unable to find "Patent Publication No. 2013-64858".  It doesn't seem to be a US application - US2013064858 relates to a polysaccharide for modulating immune response.  Can you tell me where it was published?
I would say Japan (considering Canon is a Japanese company - they would file all initial Patent applications in Japan, and use world-wide agreements on IP protection whilst they filed patents elsewhere)

Thanks.  I have now found it on the Japanese IPO website.

jrista

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Re: Patent: EF 400 f/4 DO IS II
« Reply #23 on: April 15, 2013, 12:51:22 PM »
Realistically I think we're looking at $7500 to $9000 for this
+1,000

DO lenses are more expensive because of the compact and light weight design. I wonder how light this lens will be? I hope it will be at 1+kg. At that weight I would be inclined to take a long hard look at the lens.

With the fluorite elements added in, I would expect a 400/4 DO to be VERY light weight. Especially if it also uses the new barrel materials found on the 300/2.8 II and its friends.

A lot of the price of these things has to do with the materials costs. It is far from cheap to grow flawless fluorite crystals, or properly etch DO glass elements, or even produce high quality optical glass. The first generation DO lenses lacked IQ a bit as they used a diffraction grating approach. I think new designs have moved towards particle dispersion in optical glass, which should offer significantly superior IQ.

I think the DO game will really get interesting when Canon ANNOUNCES 500, 600, and 800mm DO lenses at half the weight and shorter physical lengths than the current designs. They will probably cost the same, will probably not be quite as good as the non-DO but slightly better than the old generation versions of those lenses. The last generation of Canon supertelephoto lenses offered some of the best IQ you could get your hands on. That kind of IQ in a smaller, lighter, more manageable package that could easily be hand-held for hours...now THAT would be something very interesting.

Mt Spokane Photography

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Re: Patent: EF 400 f/4 DO IS II
« Reply #24 on: April 15, 2013, 01:15:32 PM »
Just a question, is it the only DO tele patent ? You "heard" something for 300mm, 500, 600... ?
About a year ago, same DO Material, just a different focal length.  Canon is covering them all with patents.
 
Don't expect to see one soon though.
 
http://www.canonrumors.com/2012/04/patent-new-diffractive-optic-patents/

Mt Spokane Photography

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Re: Patent: EF 400 f/4 DO IS II
« Reply #25 on: April 15, 2013, 01:43:07 PM »
Realistically I think we're looking at $7500 to $9000 for this
+1,000

 I think new designs have moved towards particle dispersion in optical glass, which should offer significantly superior IQ.


They use a partical dispersion in plastic resin, and its a radial dispersion which is then bonded to glass. 
 
 
Here is one patent by Sumitomo:
http://www.patentgenius.com/patent/7985476.html
 
 
Canon: A new one last fall which improves the process.  They keep churning these out as well. Eventually, we will see one that works.
 "DISCLOSURE OF THE INVENTION In view of the above described problems, a principal object of the present invention is to provide a composite material containing fine nano-oxide particles uniformly dispersed in an organic matrix with a degree of agglomeration among particles being reduced.
Another object of the present invention is to provide a production process of the composite material and a production process of a dispersant for the fine nano-oxide particles.
According to an aspect of the present invention, there is provided a composite material comprising:
fine nano-oxide particles;
a dispersant; and
a transparent resin material, ... "
 
http://www.freepatentsonline.com/20130079452.pdf
 
 

WPJ

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Re: Patent: EF 400 f/4 DO IS II
« Reply #26 on: April 15, 2013, 01:53:46 PM »
What about a 100-400do lens.....f2.8

jrista

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Re: Patent: EF 400 f/4 DO IS II
« Reply #27 on: April 15, 2013, 01:56:41 PM »
What about a 100-400do lens.....f2.8

$15,000, anyone? ;P

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Re: Patent: EF 400 f/4 DO IS II
« Reply #27 on: April 15, 2013, 01:56:41 PM »

TrumpetPower!

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Re: Patent: EF 400 f/4 DO IS II
« Reply #28 on: April 15, 2013, 02:41:38 PM »
What about a 100-400do lens.....f2.8

$15,000, anyone? ;P

I think you're missing a zero....

b&

jrista

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Re: Patent: EF 400 f/4 DO IS II
« Reply #29 on: April 15, 2013, 03:23:16 PM »
What about a 100-400do lens.....f2.8

$15,000, anyone? ;P

I think you're missing a zero....

b&

$150,000? Nah, I can't imagine even an f/2.8 100-400 zoom costing that much. I do think such a lens would probably cost as much as one of the supertele primes, though.

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Re: Patent: EF 400 f/4 DO IS II
« Reply #29 on: April 15, 2013, 03:23:16 PM »