September 30, 2014, 08:27:55 PM

Author Topic: Lens Announcement Coming in February? [CR1]  (Read 5915 times)

Plainsman

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Re: Lens Announcement Coming in February? [CR1]
« Reply #15 on: February 07, 2014, 07:14:28 AM »
If the new 100-400 is another extending zoom lens like the latest flimsy Sony and Nikon zooms I personally wouldn't bother waiting for it.

The new Nikon 80-400 appears to be hardly any sharper than Canon's current 100-400 and is a lot more expensive.

The current Canon 100-400 lens is a very good design and the only way Canon will significantly improve on it is to bring out an IF version say 140-400/5.6 ie a scaled up version of the peerless 70-200/2.8.

But will they do that - I doubt it - it would be to sharp and affect sales further up the chain. That's Canon logic for you.
« Last Edit: February 07, 2014, 11:02:53 AM by Plainsman »

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Re: Lens Announcement Coming in February? [CR1]
« Reply #15 on: February 07, 2014, 07:14:28 AM »

neuroanatomist

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Re: Lens Announcement Coming in February? [CR1]
« Reply #16 on: February 07, 2014, 08:27:47 AM »
It's also about time we had a Canon 1.4x and 2.0x extender that retained AF past f5.6/8.0 - I'm sure it's a marketing ploy rather than technical

LOL.

Haydn1971, meet optical physics.  Optical physics, meet Haydn1971.  It's clear the two don't know each other.    ;)

The f/number is a ratio of focal length to the diameter of the iris diaphragm.  Putting the TC behind the lens increases the focal length, but doesn't change the physical aperture inside the lens.   

A 400mm f/5.6 lens has a 71.4mm physical aperture: 400mm/71.4mm = 5.6.  If you put a 1.4x TC behind it, you multiply the focal length by 1.4x, to 560mm.  Therefore, you now have a 560mm/71.4mm = f/7.84 (call it f/8) lens.  If your camera supports AF at only f/5.6, AF won't work.

A 200mm f/2 lens has a 100mm physical aperture: 200mm/100mm = 2.  If you put a 2x TC behind it, you multiply the focal length by 2x, to 400mm.  Therefore, you now have a 400mm/100mm = f/4 lens. 
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Viggo

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Re: Lens Announcement Coming in February? [CR1]
« Reply #17 on: February 07, 2014, 08:47:16 AM »
So more waiting for the 35 L II then  ::)
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tron

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Re: Lens Announcement Coming in February? [CR1]
« Reply #18 on: February 07, 2014, 09:10:45 AM »
So more waiting for the 35 L II then  ::)
Don't worry! CR guys always want new threads. So rest assure they will create one with a CR1 rating just to cause people putting comments ;D
P.S If that new 100-400L appears soon this year I will take back my comments  ;D  ;D  ;D

Maximilian

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Re: Lens Announcement Coming in February? [CR1]
« Reply #19 on: February 07, 2014, 09:13:55 AM »
It's also about time we had a Canon 1.4x and 2.0x extender that retained AF past f5.6/8.0 - I'm sure it's a marketing ploy rather than technical

LOL.

Haydn1971, meet optical physics.  Optical physics, meet Haydn1971.  It's clear the two don't know each other.   ::)

The f/number is a ratio of focal length to the diameter of the iris diaphragm.  Putting the TC behind the lens increases the focal length, but doesn't change the physical aperture inside the lens.   

A 400mm f/5.6 lens has a 71.4mm physical aperture: 400mm/71.4mm = 5.6.  If you put a 1.4x TC behind it, you multiply the focal length by 1.4x, to 560mm.  Therefore, you now have a 560mm/71.4mm = f/7.84 (call it f/8) lens.  If your camera supports AF at only f/5.6, AF won't work.

A 200mm f/2 lens has a 100mm physical aperture: 200mm/100mm = 2.  If you put a 2x TC behind it, you multiply the focal length by 2x, to 400mm.  Therefore, you now have a 400mm/100mm = f/4 lens.
As far as I understand Haydn1971, it's not about retaining the aperture to the same value as without TC,
but to keep AF still working, even if the aperture gets to values above f5.6/8.0 with TC on,
as it is still working with the 1DX.
If so, of course we are still talking about optical physics, because the lens now gathers less light and the AF sensor must be sensible enough to deliver a proper and reliable AF.
sometimes you have to close your eyes to see properly.

hbolte

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Re: Lens Announcement Coming in February? [CR1]
« Reply #20 on: February 07, 2014, 09:23:31 AM »
I think this latest rumor must bring the 100-400 replacement rumor count to over a hundred! I cannot imagine them not announcing it at CP+ if it's coming. I hope it is!

tron

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Re: Lens Announcement Coming in February? [CR1]
« Reply #21 on: February 07, 2014, 09:28:15 AM »
I think this latest rumor must bring the 100-400 replacement rumor count to over a hundred! I cannot imagine them not announcing it at CP+ if it's coming. I hope it is!
Rumor has it that is is coming and it will be presented by Bigfoot itself  ;D  ;D  ;D

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Re: Lens Announcement Coming in February? [CR1]
« Reply #21 on: February 07, 2014, 09:28:15 AM »

TrabimanUK

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Re: Lens Announcement Coming in February? [CR1]
« Reply #22 on: February 07, 2014, 10:04:51 AM »
I think this latest rumor must bring the 100-400 replacement rumor count to over a hundred! I cannot imagine them not announcing it at CP+ if it's coming. I hope it is!

so is that 100-400 rumours?  ;)
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Daniel Flather

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Re: Lens Announcement Coming in February? [CR1]
« Reply #23 on: February 07, 2014, 02:34:13 PM »
I think this latest rumor must bring the 100-400 replacement rumor count to over a hundred! I cannot imagine them not announcing it at CP+ if it's coming. I hope it is!

so is that 100-400 rumours?  ;)

Lol
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Don Haines

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Re: Lens Announcement Coming in February? [CR1]
« Reply #24 on: February 07, 2014, 03:52:20 PM »
I think this latest rumor must bring the 100-400 replacement rumor count to over a hundred! I cannot imagine them not announcing it at CP+ if it's coming. I hope it is!
Rumor has it that is is coming and it will be presented by Bigfoot itself  ;D  ;D  ;D
I hope not! All pictures involving Bigfoot are very blurry... :)
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LetTheRightLensIn

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Re: Lens Announcement Coming in February? [CR1]
« Reply #25 on: February 07, 2014, 06:51:18 PM »
It's also about time we had a Canon 1.4x and 2.0x extender that retained AF past f5.6/8.0 - I'm sure it's a marketing ploy rather than technical

LOL.

Haydn1971, meet optical physics.  Optical physics, meet Haydn1971.  It's clear the two don't know each other.    ;)

The f/number is a ratio of focal length to the diameter of the iris diaphragm.  Putting the TC behind the lens increases the focal length, but doesn't change the physical aperture inside the lens.   

A 400mm f/5.6 lens has a 71.4mm physical aperture: 400mm/71.4mm = 5.6.  If you put a 1.4x TC behind it, you multiply the focal length by 1.4x, to 560mm.  Therefore, you now have a 560mm/71.4mm = f/7.84 (call it f/8) lens.  If your camera supports AF at only f/5.6, AF won't work.

A 200mm f/2 lens has a 100mm physical aperture: 200mm/100mm = 2.  If you put a 2x TC behind it, you multiply the focal length by 2x, to 400mm.  Therefore, you now have a 400mm/100mm = f/4 lens.

It's both. The Kenko DGX with full spoofing allows for perfectly fine f/8 AF with the 70-300L on a 5D3 even without the f/8 AF firmware. The Canon 1.4x III+70-300L would surely allow for good AF too on a 5D3 but they lock that combo out and force you to buy a Kenko. That said some of it is real too for sure.

neuroanatomist

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Re: Lens Announcement Coming in February? [CR1]
« Reply #26 on: February 07, 2014, 08:02:53 PM »
The Canon 1.4x III+70-300L would surely allow for good AF too on a 5D3 but they lock that combo out and force you to buy a Kenko. That said some of it is real too for sure.

One thing that's real is you can't physically mount the Canon 1.4x behind the 70-300L unless you zoom the lens out longer than ~250mm, then if you zoom in you'll smack the rear element into the front of the TC.  I'd put that in the 'don't try this at home, kids' category.

Also, I think the Kenko combo locks up a 5DIII if you've got AFMA applied, I know it does with the 100L.  So, 'perfect AF' that isn't.

Taping three pins on the Canon 1.4x allows AF to function with an f/5.6 lens...but not well.  I suspect that's why Canon locks it out in firmware.
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MichaelHodges

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Re: Lens Announcement Coming in February? [CR1]
« Reply #27 on: February 07, 2014, 08:53:33 PM »
I think this latest rumor must bring the 100-400 replacement rumor count to over a hundred! I cannot imagine them not announcing it at CP+ if it's coming. I hope it is!
Rumor has it that is is coming and it will be presented by Bigfoot itself  ;D  ;D  ;D
I hope not! All pictures involving Bigfoot are very blurry... :)


Mitch Hedberg had an amazing joke about this:

https://www.youtube.com/watch?v=eMm1YTd8lHM

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Re: Lens Announcement Coming in February? [CR1]
« Reply #27 on: February 07, 2014, 08:53:33 PM »

tron

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Re: Lens Announcement Coming in February? [CR1]
« Reply #28 on: February 10, 2014, 06:45:02 AM »
This is a first time source, please treat this information accordingly.
We will (think Windows Recycle Bin  ;D or ... CR0  ;D  ;D ;D )

Canon1

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Re: Lens Announcement Coming in February? [CR1]
« Reply #29 on: February 10, 2014, 08:25:50 AM »
I think this latest rumor must bring the 100-400 replacement rumor count to over a hundred! I cannot imagine them not announcing it at CP+ if it's coming. I hope it is!
Rumor has it that is is coming and it will be presented by Bigfoot itself  ;D  ;D  ;D
I hope not! All pictures involving Bigfoot are very blurry... :)


Mitch Hedberg had an amazing joke about this:

https://www.youtube.com/watch?v=eMm1YTd8lHM

Damn... you beat me to it.  I too find it scary that "There's a large, out-of-focus monster roaming the countryside."

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Re: Lens Announcement Coming in February? [CR1]
« Reply #29 on: February 10, 2014, 08:25:50 AM »