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Author Topic: New patents for Canon fast primes  (Read 4796 times)

John Thomas

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New patents for Canon fast primes
« on: April 03, 2013, 01:49:44 AM »
It seems that some high quality fast prime lenses (50mm f/1.2, 50mm f/1.4 - there is also an 45mm f/1.6 and a 60mm f/1.8) are in the pipeline at Canon. I am not sure though (from translation) that they are EF lenses. See at

http://translate.google.com/translate?sl=ja&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&eotf=1&u=http%3A%2F%2Fegami.blog.so-net.ne.jp%2F2013-03-29

The original source: http://egami.blog.so-net.ne.jp/2013-03-29

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New patents for Canon fast primes
« on: April 03, 2013, 01:49:44 AM »

J.R.

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Re: New patents for Canon fast primes
« Reply #1 on: April 03, 2013, 02:09:36 AM »
60mm f/1  :o :o

You made me check the link ... it's 60mm f/1.8.

The link mentions that the patent is for cine / video lenses but most interestingly, doesn't mention whether or not the lenses have IS.

It seems that some high quality fast prime lenses (50mm f/1.2, 50mm f/1.4 - there is also an 45mm f/1.6 and a 60mm f/1.8) are in the pipeline at Canon. I am not sure though (from translation) that they are EF lenses. See at

http://translate.google.com/translate?sl=ja&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&eotf=1&u=http%3A%2F%2Fegami.blog.so-net.ne.jp%2F2013-03-29

The original source: http://egami.blog.so-net.ne.jp/2013-03-29
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John Thomas

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Re: New patents for Canon fast primes
« Reply #2 on: April 04, 2013, 01:03:06 AM »
60mm f/1  :o :o

You made me check the link ... it's 60mm f/1.8.

The link mentions that the patent is for cine / video lenses but most interestingly, doesn't mention whether or not the lenses have IS.

It seems that some high quality fast prime lenses (50mm f/1.2, 50mm f/1.4 - there is also an 45mm f/1.6 and a 60mm f/1.8) are in the pipeline at Canon. I am not sure though (from translation) that they are EF lenses. See at

http://translate.google.com/translate?sl=ja&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&eotf=1&u=http%3A%2F%2Fegami.blog.so-net.ne.jp%2F2013-03-29

The original source: http://egami.blog.so-net.ne.jp/2013-03-29




 :) ...it wasn't intended. I wrote 60 mm f/1.8 and after that Closing Parenthesis.

RGF

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Re: New patents for Canon fast primes
« Reply #3 on: April 05, 2013, 01:13:56 AM »
Patents do not guarnatee production.  Sometimes they are done to hold IP.

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Re: New patents for Canon fast primes
« Reply #4 on: April 05, 2013, 04:38:57 AM »
Patents do not guarnatee production.  Sometimes they are done to hold IP.

Shure, but these patents show typical lens designs which penetrate the market since a few years: Standard lenses with a negative front element. This is well known from wide angle lenses for (D)SLRs which use retrofocus designs to give enough space between last lens and image plane.

If I read the patent correctly Canon has decided to use a retrofocus design instead of a double gaussian design to avoid problems with longitudinal CAs: The retrofocus design gives more variability to introduce more lenses/alternative lens geometries to adress longitudinal CA correction without compromising other parameters.

Longitudinal CAs are the main problem with high aperture lenses which aren't easily removed during post processing - I am shure that these patents have a good chance to flow into real products!

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Re: New patents for Canon fast primes
« Reply #5 on: April 05, 2013, 09:48:21 AM »
60mm f/1  :o :o

You made me check the link ... it's 60mm f/1.8.

The link mentions that the patent is for cine / video lenses but most interestingly, doesn't mention whether or not the lenses have IS.

It seems that some high quality fast prime lenses (50mm f/1.2, 50mm f/1.4 - there is also an 45mm f/1.6 and a 60mm f/1.8) are in the pipeline at Canon. I am not sure though (from translation) that they are EF lenses. See at

http://translate.google.com/translate?sl=ja&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&eotf=1&u=http%3A%2F%2Fegami.blog.so-net.ne.jp%2F2013-03-29

The original source: http://egami.blog.so-net.ne.jp/2013-03-29



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Re: New patents for Canon fast primes
« Reply #6 on: April 05, 2013, 09:55:54 AM »
Wasn't really him, the forum software automatically replaces an 8 followed by a ) with 8) .  Even though I know this from experience, it still gets me sometimes (usually with lenses having a max aperture of f/2.8).  See what I mean?   ;)
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Re: New patents for Canon fast primes
« Reply #6 on: April 05, 2013, 09:55:54 AM »

Sporgon

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Re: New patents for Canon fast primes
« Reply #7 on: April 06, 2013, 04:49:37 AM »
Ah, and all this time I thought people were doing it purposely to show their appreciation of the 50mm f1.2 (or 85mm f1.8)


RGF

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Re: New patents for Canon fast primes
« Reply #8 on: April 06, 2013, 04:58:55 PM »
Patents do not guarnatee production.  Sometimes they are done to hold IP.

Shure, but these patents show typical lens designs which penetrate the market since a few years: Standard lenses with a negative front element. This is well known from wide angle lenses for (D)SLRs which use retrofocus designs to give enough space between last lens and image plane.

If I read the patent correctly Canon has decided to use a retrofocus design instead of a double gaussian design to avoid problems with longitudinal CAs: The retrofocus design gives more variability to introduce more lenses/alternative lens geometries to adress longitudinal CA correction without compromising other parameters.

Longitudinal CAs are the main problem with high aperture lenses which aren't easily removed during post processing - I am shure that these patents have a good chance to flow into real products!

Just my 2ct - Best, Michael

Michael

Thanks for the information.  My knowledge of optics is limited but in my professional carrier (now retired) I worked with two many lawyers  :-[

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Re: New patents for Canon fast primes
« Reply #9 on: April 06, 2013, 05:59:38 PM »
Patents do not guarnatee production.  Sometimes they are done to hold IP.

Shure, but these patents show typical lens designs which penetrate the market since a few years: Standard lenses with a negative front element. This is well known from wide angle lenses for (D)SLRs which use retrofocus designs to give enough space between last lens and image plane.

If I read the patent correctly Canon has decided to use a retrofocus design instead of a double gaussian design to avoid problems with longitudinal CAs: The retrofocus design gives more variability to introduce more lenses/alternative lens geometries to adress longitudinal CA correction without compromising other parameters.

Longitudinal CAs are the main problem with high aperture lenses which aren't easily removed during post processing - I am shure that these patents have a good chance to flow into real products!

Just my 2ct - Best, Michael

Which is also what Zeiss announced a while back, with their 50mm f/1.4 Distagon (Distagon is their retrofocus, normally found in 21-35mm, or 40-65mm on Medium Format).
Either canon's going down the same path, or they're at least going to patent some to block zeiss.
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Re: New patents for Canon fast primes
« Reply #9 on: April 06, 2013, 05:59:38 PM »