December 20, 2014, 04:46:05 AM

Author Topic: Patent: Canon EF 70-400 f/4.5-5.6L IS  (Read 9025 times)

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Patent: Canon EF 70-400 f/4.5-5.6L IS
« on: February 04, 2014, 06:04:39 AM »

2014 will see the replacement of the Canon EF 100-400 f/4.5-5.6L IS, and we should see some new new patents showing new optical formulas for its replacement. Below is a patent for an EF 70-400 f/4.5-5.6L IS.


Description and self-interpretation of the patent literature



  • Patent Publication No. 2014-21256,2014-21257

    • Publication date 2014.2.3

    • Filing date 2012.7.18



  • Example 2

    • Zoom ratio 5.45

    • Focal length f = 71.33-144.71-388.95mm

    • Fno. 4.63-4.84-5.83

    • Half angle ω = 16.87-8.50-3.18 °

    • Image height Y = 21.64

    • 240.00-284.68-303.83mm overall length of the lens

    • BF 75.92-79.30-95.93mm

    • 6-group zoom of positive and negative positive and negative positive and negative

    • (Part of the fourth group) anti-vibration

    • Rear Focus (Group 6)




Source: [EG]


cr


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Patent: Canon EF 70-400 f/4.5-5.6L IS
« on: February 04, 2014, 06:04:39 AM »

Eldar

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #1 on: February 04, 2014, 06:23:26 AM »
If they keep the size about the same as the current 100-400, drop the push-pull and improve IQ, this could be a very tempting lens ...
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pj1974

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #2 on: February 04, 2014, 06:26:53 AM »
Hmmm "2014 WILL see the replacement of the Canon EF 100-400 f/4.5-5.6L IS"

Well, that's interesting!!! Not 'may'!

I love my 70-300mm (great IQ, and still so portable). I expect any 70-400mm will be significantly larger (& more expensive) - but would be a great 'zoom' birding lens.

Then there's the 200-400mm 1.4x... *sigh*

The Tamron 150-600mm looks like a decent budget birding zoom... reviews showing it's decent at 600mm at between f/8 and f/11.

But still... we're talking about a potential Canon 70-400mm... yes, I expect it will be EF too.

:)  Paul
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Albi86

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #3 on: February 04, 2014, 06:46:02 AM »
It will be interesting to see if/how it copes with 1.4x TC VS the Tamron.

dufflover

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #4 on: February 04, 2014, 06:59:42 AM »
This particular patent says 240mm lens length (right?) so that puts it a tad shorter than the 400mm/5.6.
And way longer than the nice 70-200 collapsed size if that's the case.
Hurry up Canon and do something with your sensors! :P

MintChocs

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #5 on: February 04, 2014, 07:11:07 AM »
I wonder what lens will weigh and more importantly what the price will be?

Marsu42

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #6 on: February 04, 2014, 07:19:00 AM »
This particular patent says 240mm lens length (right?) so that puts it a tad shorter than the 400mm/5.6.
And way longer than the nice 70-200 collapsed size if that's the case.

The 70-200L is 200mm (internal zoom), and this is on the very edge of portable ... the 70-300L is only 143mm collapsed.

This puts this new patent in another class entirely, and thus the zoom range is a bit bit strange - who would want to use this @70mm except for dedicated usage cases when very high flexibility is required? The difference between ~300 and 390 isn't that large w/o tc, so if I were to use this instead of the 70-300L the new lens would have to have terrific iq ... which also means very high weight & price.

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #6 on: February 04, 2014, 07:19:00 AM »

GreenViper

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #7 on: February 04, 2014, 07:45:27 AM »

To be honest, if the replacement for the 100-400 is going to be extended in range and noticeably larger, I'd much prefer the extended range at the long end e.g. 100-500 or 150-500 for my 5D3. The gap between the current 100-400 and the supertelephotos for 400+ range is quite frankly a financial chasm. Something like a high quality 150-500 at $2000-3000 range would go a long way to filling that gap. Canon could get a number of enthusiasts to spend this much more for such a lens without in any way impacting its supertelephoto sales.
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CatfishSoupFTW

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #8 on: February 04, 2014, 07:54:05 AM »
70-400 2.8 IS .

this. hahahah, for an arm and a leg. 70-400 would seem like a nice focal length though. i still wouldnt mind push pull. either or would be fine imho.
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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #9 on: February 04, 2014, 07:58:46 AM »
This particular patent says 240mm lens length (right?) so that puts it a tad shorter than the 400mm/5.6.
And way longer than the nice 70-200 collapsed size if that's the case.

The 70-200L is 200mm (internal zoom), and this is on the very edge of portable ... the 70-300L is only 143mm collapsed.

This puts this new patent in another class entirely, and thus the zoom range is a bit bit strange - who would want to use this @70mm except for dedicated usage cases when very high flexibility is required? The difference between ~300 and 390 isn't that large w/o tc, so if I were to use this instead of the 70-300L the new lens would have to have terrific iq ... which also means very high weight & price.

I can see many applications, especially in sports and action.  I shot a lot with the 300 F/2.8 IS II last year, and definitely was aching for some extra reach.

The 70 - 300 has been tempting, but my 70-200 F/2.8 IS II I think has slightly better IQ, not to mention a lot faster, so have a hard time justifying dropping $1500 for just having 100 extra MM

Now the 200-400... Car or lens... Car or Lens...

So for the 70-400 with the same aperture range as the old 100-400?  I only stayed away from the 100-400 because I heard it was a dust sucker, have used it/rented it twice and it was decent,  but the 300-400 range can be very convenient, especially when you don't have to swing / switch bodies as object gets closer. 

If the 70-400 has the slightly better IQ and better sealing, and no more push/pull I think it is a decent upgrade.

I still will likely pull the trigger on the Tamron because of price, and for what I have seen the IQ is decent.  Even if the 600 really needs F/8 or F/11, I figure getting upwards of 500mm for that price still is a bargain, and makes a nice compliment of 70-200 on one body and 150-600 on a second. 

J.R.

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #10 on: February 04, 2014, 08:09:06 AM »
Yet another patent ... Canon does seem to be on a bit of an innovation overdrive  ;D

OTOH, this is yet another patent that may not see light of day.
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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #11 on: February 04, 2014, 08:48:37 AM »
So many patents and just a few new lenses but not the ones we're expecting like a new 100-400, new 400... At least they 're searching for the right formula 8)

Haydn1971

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #12 on: February 04, 2014, 09:35:27 AM »
Having a 70-300mm, personally, I would rather see something in the 200-460mm f4-5.6 range - that would give a max 82mm front element and tie in with the 70-200 lenses too...   Although I shudder to think of the cost. !
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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #12 on: February 04, 2014, 09:35:27 AM »

DanielW

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #13 on: February 04, 2014, 09:36:34 AM »
70-400 2.8 IS .

this. hahahah, for an arm and a leg. (...)

I'd suggest keeping both arms and both legs, as you will end up with a heavy toy... :)

Marsu42

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #14 on: February 04, 2014, 09:38:23 AM »
I can see many applications, especially in sports and action.  I shot a lot with the 300 F/2.8 IS II last year, and definitely was aching for some extra reach.

No doubt a lot of people are, I was talking about the 70mm wide end - it's probably there to go along with Canon's new 24-70 lenses and to phase out the 24-105, but the 70-100 range will come at a cost and it's doubtful how many people will need this part on a tele lens... if you want flexible get a 70-300L as this is much more portable.

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #14 on: February 04, 2014, 09:38:23 AM »