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Author Topic: Canon EF 100-400 f/4-5.6L IS Patent Pending  (Read 8719 times)

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Canon EF 100-400 f/4-5.6L IS Patent Pending
« on: September 20, 2011, 07:53:30 AM »

New 100-400 f/4-5.6L IS Optical Design

New 100-400 f/4-5.6L IS in the pipeline? A pending patent has shown up showing a new 100-400 optical design. This new design seems to suggest better optical performance as well as starting at f/4.

Current 100-400 f/4.5-5.6L IS Optical Design

Patent Publication No. 2011-180218

  • 2011.9.15 Release Date
  • Filing date 2010.2.26

Example 1

  • Focal length f = 72.20 – 135.00 – 290.00mm
  • Fno = 4.20 – 4.67 – 5.86
  • Half angle of 16.68 – 9.10 – 4.27 °
  • Image height 21.64mm
  • Lens length 185.20 – 214.53 – 239.20mm
  • Back Focus 46.74 – 47.82 – 57.41mm
  • 4.02x zoom ratio
  • Group 6 for each group
  • Positive and negative polarity positive or negative group configuration

Example 2

  • Focal length f = 102.20 – 200.00 – 390.01mm
  • Fno = 4.10 – 4.55 – 5.90
  • Half angle of 11.95 – 6.17 – 3.18 °
  • Image height 21.64mm
  • Lens length 228.18 – 258.83 – 288.12mm
  • Back Focus 51.23 – 54.42 – 69.84mm
  • 3.82x zoom ratio
  • Group 6 for each group
  • Positive and negative polarity positive or negative group configuration

Example 3

  • Focal length f = 100.20 – 135.10 – 290.19mm
  • Fno = 4.36 – 4.47 – 5.81
  • Half angle of 12.18 – 9.10 – 4.26 °
  • Image height 21.64mm
  • Lens length 184.66 – 198.82 – 244.82mm
  • Back Focus 42.53 – 46.68 – 63.07mm
  • 2.90x zoom ratio
  • 5 groups, each group
  • Positive and negative group of negative polarity configuration
  • Positive-lead type zoom lens
  • High zoom ratio can be easily realized
  • Rear Focus
  • Can be miniaturized
  • Easy full-time manual
  • Suppressing the fluctuation of spherical aberration
  • Upon zooming, if you move from behind the eyes, counting the two groups, the greater the variation of spherical aberration in the focusing
  • On-axis beam angle θ the following equation:
  • θ = AISN (1 / 2 * Fno)
  • Spherical aberration is proportional to the fourth power of the high on-axis ray
  • In focusing heavily on the object side to move first, counting from one group behind, which varies significantly higher on-axis ray
  • Canon’s patents, and by fixing the first two groups, counting from the back of the eye movement to limit the amount counted from the first team back, suppressing the fluctuation of spherical aberration
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Canon EF 100-400 f/4-5.6L IS Patent Pending
« on: September 20, 2011, 07:53:30 AM »

GMCPhotographics

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Re: Canon EF 100-400 f/4-5.6L IS Patent Pending
« Reply #1 on: September 20, 2011, 08:17:06 AM »
Can someone knowledgable please explain the three examples? Surely these are three different lenses? A 70-300, a 100-400 and a 100-300. Is this correct?

adhocphotographer

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Re: Canon EF 100-400 f/4-5.6L IS Patent Pending
« Reply #2 on: September 20, 2011, 08:29:34 AM »
there is already 3 70-300's and a 100-300 would just be overlap...  100-400 update would be great... how long it will take to see the light of day is a completely different story!
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Re: Canon EF 100-400 f/4-5.6L IS Patent Pending
« Reply #3 on: September 20, 2011, 08:31:57 AM »
This is certainly interesting. I do need a long lens and the 100-400 was one that I was looking at. A Mark II version of that one would be nice, especially if it turns out to be a bit faster as well.
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J. McCabe

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Re: Canon EF 100-400 f/4-5.6L IS Patent Pending
« Reply #4 on: September 20, 2011, 08:49:17 AM »
Why is the image height 21.64mm ?

Is it because those are APS-C lenses, or because that's half the radius required to cover an FF sensor ?

smirkypants

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Re: Canon EF 100-400 f/4-5.6L IS Patent Pending
« Reply #5 on: September 20, 2011, 09:12:02 AM »
Can we please just get a 200-400 f/4 zoom? Please? Before I go buy a Nikon? I'd really like to be able to take a decent photo at 400mm when skies are gray without being stuck with a prime. Thanks Canon.

Mihast

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Re: Canon EF 100-400 f/4-5.6L IS Patent Pending
« Reply #6 on: September 20, 2011, 09:17:06 AM »
Can someone knowledgable please explain the three examples? Surely these are three different lenses? A 70-300, a 100-400 and a 100-300. Is this correct?

Contrary to polular beleive, patents are not granted to specific lenes designs but to solutions of optical problems (see claims section of patents or patent applications). Examples that demonstrate said solutions are of course more interesting to general public as they demonstrate (more or less) practical lenses and some of them may even see production.

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Re: Canon EF 100-400 f/4-5.6L IS Patent Pending
« Reply #6 on: September 20, 2011, 09:17:06 AM »

neuroanatomist

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Re: Canon EF 100-400 f/4-5.6L IS Patent Pending
« Reply #7 on: September 20, 2011, 09:36:19 AM »
Why is the image height 21.64mm ?

Is it because those are APS-C lenses, or because that's half the radius required to cover an FF sensor ?

I'd assume it's the radius of the image circle (not half the radius, since the radius is already half the diameter).   EF lenses have a 43.2 mm diameter image circle, and 2 x 21.64 mm = 43.3 mm.
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Meh

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Re: Canon EF 100-400 f/4-5.6L IS Patent Pending
« Reply #8 on: September 20, 2011, 09:56:18 AM »
Contrary to polular beleive, patents are not granted to specific lenes designs but to solutions of optical problems (see claims section of patents or patent applications). Examples that demonstrate said solutions are of course more interesting to general public as they demonstrate (more or less) practical lenses and some of them may even see production.

Exactly correct.  In addition, it's not a given that Canon (or any other lens designer) would file patents for a new design only if it is an improvement.  They might even file a patent they have no intention of ever using.  Their designers are working all the time and let's say they come up with a new design that is almost as good as their current design.  They might file the patent to prevent say Sigma from using it to market a lens that is seen as almost as good as the Canon but lower price.

AJ

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Re: Canon EF 100-400 f/4-5.6L IS Patent Pending
« Reply #9 on: September 20, 2011, 11:03:56 AM »
I suppose another way to look at this is that a 100-400 mk2 isn't just around the corner.  It's still early in its development phase.

ecka

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Re: Canon EF 100-400 f/4-5.6L IS Patent Pending
« Reply #10 on: September 20, 2011, 11:11:55 AM »
May I ask for EF 100-300/4L IS USM, please  ::) Canon? Which you should have made instead of 70-300L.
What? Come back in 2021? O.K. I'll wait, thank you. See you later.

P.S. lol
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Re: Canon EF 100-400 f/4-5.6L IS Patent Pending
« Reply #11 on: September 20, 2011, 11:53:20 AM »
I have no idea how to read patents so ... can anyone tell if this would still be a push-pull design?  rotating zoom would be much preferred ... although frankly, with the 2X on the 70-200 f/2.8, I'm not really in the market for a repeat lens in this range.

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Re: Canon EF 100-400 f/4-5.6L IS Patent Pending
« Reply #12 on: September 20, 2011, 12:09:59 PM »
Can we please just get a 200-400 f/4 zoom? Please?
They announced it a while ago... only a matter of time before it's in production. Someone more geeky than me might be able to say how long a typical delay is between announcement and production release.

I have no idea how to read patents so ... can anyone tell if this would still be a push-pull design?
I think this is only for the optical formula, and nothing to do with the build.
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Re: Canon EF 100-400 f/4-5.6L IS Patent Pending
« Reply #12 on: September 20, 2011, 12:09:59 PM »

Dave

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Re: Canon EF 100-400 f/4-5.6L IS Patent Pending
« Reply #13 on: September 20, 2011, 01:00:35 PM »
Despite the push/pull design... what's so bad about the current 100-400ß?

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Re: Canon EF 100-400 f/4-5.6L IS Patent Pending
« Reply #14 on: September 20, 2011, 01:39:08 PM »
It doesn't matter if you have the best there is. Someone will still want "better".

Specifically on a hypothetical 100-400L II, I think the most significant changes will be in areas other than the basic optics. The push-pull vs. twist argument will probably go on forever but at the end of the day you get what you're given or look elsewhere. Updated IS would be a given, and I'd expect a weather sealing upgrade too. If the optics are improved on top of that, I don't think there's much to complain about other than the price tag.
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Re: Canon EF 100-400 f/4-5.6L IS Patent Pending
« Reply #14 on: September 20, 2011, 01:39:08 PM »