August 01, 2014, 03:09:42 AM

Author Topic: Patent: Canon EF 70-400 f/4.5-5.6L IS  (Read 7544 times)

mrsfotografie

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #45 on: February 05, 2014, 01:14:25 PM »
I think Canon can do a good job om making a 70-400 that's not too heave, as mentioned before in this thread.


We'll see, but the length of this patent design might indicate a high weight - they probably don't just put air inside it :-) ... the 100-400L is 189mm max, this patent is 303mm!


Sorry, but the 189mm is in retracted state! The 100-400 will extend to 277mm, not counting the lens hood ;)

http://www.the-digital-picture.com/Reviews/Lens-Specifications.aspx?Lens=113

Why are three lengths stated in the patent? "240.00-284.68-303.83"

« Last Edit: February 05, 2014, 01:16:19 PM by mrsfotografie »
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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #45 on: February 05, 2014, 01:14:25 PM »

Marsu42

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #46 on: February 05, 2014, 02:15:42 PM »
Sorry, but the 189mm is in retracted state! The 100-400 will extend to 277mm, not counting the lens hood ;)

Ok, thanks, that's wikipedia for you :-p (I've just got the 70-300L).

Why are three lengths stated in the patent? "240.00-284.68-303.83"

Good question, plus I don't remember the 303 number from yesterday when looking how long this patented lens is :-o

Lee Jay

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #47 on: February 05, 2014, 08:15:29 PM »
Why are three lengths stated in the patent? "240.00-284.68-303.83"

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 °
240.00-284.68-303.83mm overall length of the lens
BF 75.92-79.30-95.93mm

I'd say, each of the three in each category corresponds to each other.

mrsfotografie

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #48 on: February 06, 2014, 04:23:07 AM »
Why are three lengths stated in the patent? "240.00-284.68-303.83"

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 °
240.00-284.68-303.83mm overall length of the lens
BF 75.92-79.30-95.93mm

I'd say, each of the three in each category corresponds to each other.

I see, looks like the intention is to describe the behavior through the range, but what is so special about that specific point between the extremes of the zoom range. It is not exactly in the middle of any of these figures...
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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #49 on: February 06, 2014, 04:40:18 AM »
They should give this lens, to CR members, to test ;) 
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mrsfotografie

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #50 on: February 06, 2014, 06:57:57 AM »
They should give this lens, to CR members, to test ;)

 ;)
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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #51 on: February 06, 2014, 07:50:27 AM »
Canon EF 100-300mm f/4 L IS with built in 1.4x TC sounds like a much better proposition. In my mind this sort of lens will satisfy the needs of the people looking for a replacement to the 100-400 push-pull zoom and it sits obediently below the 200-400mm f/4 1.4x TC.

With TC-on that would give 140-420 f/5.6. If priced between $2100-2600 and the IQ at f/4 matched the 100mm macro (non-L) and 300mm IS then I'd say they have a winner.

P.S. (100macro non-L) + (300mm f/4L IS) + (1.4x TC) = $2550

The notion of a 100-300 f/4 + 1.4TC is also intriguing. It's wishful thinking that it's price would equal the $2,550 sum of the prices of a 100 macro + 300 f/4 + 1.4x TC, but I'd willingly shell out up to $1,000 more for a lens like this.

Of course, but I can always try to be optimistic. Sure I'd also be willing to pay a bit more especially considering it would offer an interesting alternative to Sigma's 120-300mm f/2.8, which is a bit soft (at f/2.8) anyway.
« Last Edit: February 06, 2014, 07:58:50 AM by StudentOfLight »
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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #51 on: February 06, 2014, 07:50:27 AM »

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #52 on: February 06, 2014, 07:24:14 PM »
Well even the minimum number in the patent is quite long compared to the original 100-400. So that's why I am talking about a longer physical size even if Canon could make it shorter - this particular patent says 5cm longer which means it isn't in that 70-200 form factor anymore. Don't get me wrong I'm sure it will be bloody good as usual for their refreshes but the "purpose" of the lens changes slightly in that it would take the role of my Sigma 120-300 (for example) which goes in a backpack, not really a "in shoulder bag ready to go travel lens" that I use my 100-400 for.
Hurry up Canon and do something with your sensors! :P

mrsfotografie

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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #53 on: February 07, 2014, 06:27:51 AM »
Well even the minimum number in the patent is quite long compared to the original 100-400. So that's why I am talking about a longer physical size even if Canon could make it shorter - this particular patent says 5cm longer which means it isn't in that 70-200 form factor anymore. Don't get me wrong I'm sure it will be bloody good as usual for their refreshes but the "purpose" of the lens changes slightly in that it would take the role of my Sigma 120-300 (for example) which goes in a backpack, not really a "in shoulder bag ready to go travel lens" that I use my 100-400 for.

If you look back at the 70's, SLR equipment has been steadily growing in size. Bigger glass has the potential for better optics, so it's not too strange that this trend continues. Fortunately the materials are getting lighter though.
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Re: Patent: Canon EF 70-400 f/4.5-5.6L IS
« Reply #53 on: February 07, 2014, 06:27:51 AM »