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Author Topic: Patent: Canon EF 300 f/4L IS II  (Read 6945 times)

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Patent: Canon EF 300 f/4L IS II
« on: August 24, 2012, 09:19:49 AM »
New Patent
Canon has filed a patent for the optical formula of a new EF 300 f/4L IS II.

Patent Publication No. 2012-159726

  • 2012.8.23 Release Date
  • 2011.2.1 filing date

Example 3

  • F = 300mm focal length
  • Fno. 4.0
  • Tele ratio 0.68
  • Inner Focus
  • φr = 68.8mm
  • φg1 = 67.8mm
  • φg2 = 70.2mm

Technical background
  • When the miniaturization of the optical system, longitudinal chromatic aberration, chromatic aberration of magnification is remarkable
  • As the focal length becomes longer, the telephoto lens system, chromatic aberration is noticeable
  • There is a method of correcting the aberrations of a material having an anomalous dispersion resin, the resin is difficult to produce high-precision thick
  • There is a method of sandwiching a thin glass resin material, the bonding peeling distortion problem bonding at high temperature

Canon patent

  • Joining three or more optical elements
  • The outer diameter of the resin is increased to reduce the distortion at the time of bonding
  • Not adhere to each other resin outer glass element
  • Between the optical element of the outside is gone, adhesive, the thickness of the adhesive distribution occurs
  • Using a sealing agent to prevent change in shape of the resin and the refractive index change due to moisture absorption
  • Do the black outer peripheral portion of the glass element
  • Prevent flare and ghosting resin at the outer periphery
  • Surface resin glue is not good

Source: [EG]

cr

« Last Edit: August 24, 2012, 09:22:40 AM by Canon Rumors »
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Patent: Canon EF 300 f/4L IS II
« on: August 24, 2012, 09:19:49 AM »

Rienzphotoz

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Re: Patent: Canon EF 300 f/4L IS II
« Reply #1 on: August 24, 2012, 10:08:00 AM »
Just out of curiosity ... how long does Canon generally take from Patent to Production?
Canon 5DMK3 70D | Nikon D610 | Sony a7 a6000 | RX100M3 | 16-35/2.8LII | 70-200/2.8LISII | 100/2.8LIS | 100-400LIS | 40/2.8 | 50/1.4 | 85/1.8 | 600EX-RTx2 | ST-E3-RT | 24/3.5 T-S | 10-18/4 OSS 16-50 | 24-70/4OSS | 55/1.8 | 55-210 OSS | 70-200/4 OSS | 28-300VR | HVL-F43M | GoPro Black 3+ & DJI Phantom

hammar

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Re: Patent: Canon EF 300 f/4L IS II
« Reply #2 on: August 24, 2012, 10:46:17 AM »
If  this lens becomes reality and is decently priced and optically awesome, I would definitely swap it for my 70-200 f/4 IS.
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Daniel Flather

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Re: Patent: Canon EF 300 f/4L IS II
« Reply #3 on: August 24, 2012, 11:09:42 AM »
$2499
| 5D3 | 8-15L | 24L II | 35L | 50L | 85L II | 100/2.8 | 200/2L | EOS M | 22 STM |

Daniel Flather

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Re: Patent: Canon EF 300 f/4L IS II
« Reply #4 on: August 24, 2012, 11:11:40 AM »
Just out of curiosity ... how long does Canon generally take from Patent to Production?

One to ∞ year(s).
| 5D3 | 8-15L | 24L II | 35L | 50L | 85L II | 100/2.8 | 200/2L | EOS M | 22 STM |

hmmm

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Re: Patent: Canon EF 300 f/4L IS II
« Reply #5 on: August 24, 2012, 11:12:29 AM »
I'm interested in this lens... I just hope they do not use too much surface resin glue.  That is not good.

hammar

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Re: Patent: Canon EF 300 f/4L IS II
« Reply #6 on: August 24, 2012, 11:52:19 AM »
$2499

You think? How about Canon being a little friendly for once and consider the poor L-lens users :)
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Re: Patent: Canon EF 300 f/4L IS II
« Reply #6 on: August 24, 2012, 11:52:19 AM »

candyman

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Re: Patent: Canon EF 300 f/4L IS II
« Reply #7 on: August 24, 2012, 12:37:55 PM »
Interesting.


What do you think? Will it be followed by a patent for a new Canon 400mm f/5.6 ? And, maybe coming with IS?

AdamJ

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Re: Patent: Canon EF 300 f/4L IS II
« Reply #8 on: August 24, 2012, 03:02:19 PM »
I'm interested in this lens... I just hope they do not use too much surface resin glue.  That is not good.

 ;D

Bosman

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Re: Patent: Canon EF 300 f/4L IS II
« Reply #9 on: August 24, 2012, 03:04:07 PM »
yawn
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mortadella

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Re: Patent: Canon EF 300 f/4L IS II
« Reply #10 on: August 24, 2012, 03:20:21 PM »
Here is a patent filing that made CR over a year ago....

http://www.canonrumors.com/2011/05/patent-ef-300-f4l-is-ii/

The current version was released in March of 1997, so an update would be nice sometime within the decade.

Price-wise, look on the bright side, however much the II costs ($2000+ ??) went does get released it will be a fraction of what you would have to pay to get your hands on a 200-400 1.4x.  We should all be happy that there are a few big whites we can get our hands on under $3000, and count our lucky stars there are a few under $2000 (at least for now)... right Canon? right?

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Re: Patent: Canon EF 300 f/4L IS II
« Reply #11 on: August 25, 2012, 07:48:00 AM »
I'd much rather use the 7-200 f/2.8 IS II USM plus the 1.4x extender than this lens - so much more flexible.

Viggo

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Re: Patent: Canon EF 300 f/4L IS II
« Reply #12 on: August 25, 2012, 10:33:39 AM »
I'm sure a used mkI 2,8 IS will be my alternative.
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Re: Patent: Canon EF 300 f/4L IS II
« Reply #12 on: August 25, 2012, 10:33:39 AM »

tron

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Re: Patent: Canon EF 300 f/4L IS II
« Reply #13 on: August 25, 2012, 10:51:21 AM »
It will be hard for Canon to beat the quality of the 300mm f/4L non-IS. We'll see...

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Re: Patent: Canon EF 300 f/4L IS II
« Reply #14 on: August 26, 2012, 05:08:39 AM »
i just hope they keep the integrated lens hood, I love the 300 F4L IS
More modern IS and full weather sealing would make great improvements as well as the more modern coatings supressing flare and CA, depending on cost I would look at an upgrade. although the sigma 120-300 f2.8 is really tempting even if i got it the 300f4L would stay just for its super well balanced and convenient sized when used with a 5D body
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Re: Patent: Canon EF 300 f/4L IS II
« Reply #14 on: August 26, 2012, 05:08:39 AM »