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FORUMS News & Rumors Lens Rumors and Predictions
Thread started 07 Dec 2015 (Monday) 07:51
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Canon EF 200-600 F/4.5-5.6 IS

 
smythie
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Joined Jun 2009
Sydney - Australia
May 09, 2017 15:36 |  #61

It is lighter though. From what I can tell it would be in the order of 10-20% lighter than a 400/4 lens with the same technology as the 300 IS II. Just not by the amount it might be if it was the front element that was a fresnel


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Archibald
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Joined May 2008
Calgary
May 09, 2017 16:07 |  #62

smythie wrote in post #18350291 (external link)
It is lighter though. From what I can tell it would be in the order of 10-20% lighter than a 400/4 lens with the same technology as the 300 IS II. Just not by the amount it might be if it was the front element that was a fresnel

I don't think there is any weight saving, but apparently the design has reduced aberrations. That is a good thing, they found a new purpose for the Fresnel design.

Here is the optical design. By fusing the Fresnels, they simultaneously reduce flare and refraction. And with the reduced refraction, they lose the reduced weight benefit. Still a very cool lens, and lighter than the 500/4.

Compare:
300/4 II 1190 grams
400DOII 2100 g
500/4 II 3190 g

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seaninsa
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Joined Sep 2011
May 09, 2017 16:30 as a reply to post 18349529 |  #63

I do not like my Sigma at all. I find it way to slow to focus.




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smythie
I wasn't even trying
Joined Jun 2009
Sydney - Australia
May 09, 2017 17:06 |  #64

Archibald wrote in post #18350319 (external link)
I don't think there is any weight saving, but apparently the design has reduced aberrations. That is a good thing, they found a new purpose for the Fresnel design.

Here is the optical design. By fusing the Fresnels, they simultaneously reduce flare and refraction. And with the reduced refraction, they lose the reduced weight benefit. Still a very cool lens, and lighter than the 500/4.

Compare:
300/4 II 1190 grams
400DOII 2100 g
500/4 II 3190 g

Most relevant is the 300/2.8 II at 2350g. Using the same technology, a 400/4.0 would be a similar weight, if not slightly heavier. Slightly less relevant is the 200/2.0 at 2520g.


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Archibald
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Calgary
May 09, 2017 17:48 |  #65

The DO cluster looks to be about 6 cm in diameter, judging from the diagram. So its volume is approx 30 cc. For typical glass densities, the weight of those elements would be 120 to 150 grams, 4 or 5 ounces. That is all they can play with weight-wise with this lens. It's less than 10% of the total weight of the lens.


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CyberDyneSystems
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Post has been edited 6 months ago by CyberDyneSystems.
May 09, 2017 22:10 |  #66

I do not think the DO elements are the entire story re: size and weight savings. I believe that by using DO elements in the design, they can reduce the size and therefore weight of other elements as well. They are using the Fresnel to ask two elements to do more than would otherwise be possible.

For instance, it is 400mm, and yet physically shorter than the 300mm f/2.8.


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Archibald
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Joined May 2008
Calgary
May 10, 2017 01:40 |  #67

We might never know for sure if the 400 DO II is heavy or light, because nobody else makes a 400/4 for comparison.

Big white lenses with larger apertures tend to be a lot longer than those with smaller apertures.


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CyberDyneSystems
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May 10, 2017 09:30 |  #68

Archibald wrote in post #18350683 (external link)
We might never know for sure if the 400 DO II is heavy or light, because nobody else makes a 400/4 for comparison.

Big white lenses with larger apertures tend to be a lot longer than those with smaller apertures.


We know how long a 400mm lens needs to be.
Aperture does not make a lens longer.
The 400mm f/5.6 is two inches longer than the DO.


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seaninsa
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Joined Sep 2011
Aug 02, 2017 14:31 |  #69

Any word yet if and when this lens will be released?




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TerryWSmith
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Joined Oct 2011
Oregon
Aug 03, 2017 07:56 as a reply to seaninsa's post |  #70

No recent news, I had been holding my breath but exhaled quite some time ago. :)

(This was a lens I truly wanted)

T.


Canon 5DIII,7D, 7DII, 50D,28-135 f4.5/5.6 IS
50 F1.8 , Canon 70-200 F2.8L Canon EF 300 F2.8 L
Canon EF 17-40L F4, Canon Ef 500 F4 IS
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seaninsa
Goldmember
1,529 posts
Joined Sep 2011
Aug 03, 2017 10:30 as a reply to TerryWSmith's post |  #71

Same here. I have the Sigma Sport and not to happy with it. This lens is something I would love to have.




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Canon EF 200-600 F/4.5-5.6 IS
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