New patents for Canon fast primes

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Jan 13, 2013
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60mm f/1 :eek: :eek:

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.

John Thomas said:
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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J.R. said:
60mm f/1 :eek: :eek:

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.

John Thomas said:
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.
 
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RGF said:
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
 
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Nov 17, 2011
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J.R. said:
60mm f/1 :eek: :eek:

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.

John Thomas said:
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

+1...he got me too
 
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RGF

How you relate to the issue, is the issue.
Jul 13, 2012
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mb66energy said:
RGF said:
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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dr croubie

Too many photos, too little time.
Jun 1, 2011
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mb66energy said:
RGF said:
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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