Canon Lens Rumors

Canon RF 1200mm Details Leak: Weighs only 0.25kg more than the RF 600mm f/4L IS USM

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Two days early, the press release details of the coming RF 1200mm f/8 L IS USM leaked, and there are a few pleasant surprises. First among them is that the lens weighs just a bit more the RF 600mm f/4 lens, which is already very light for that focal length. A person Digicame-Info believes was the author of the now-defunct Nokishita blog posted posted the press release detailing the specs.

The minimum focus distance (MFD) is 4.3m, also roughly the same as the 600mm f/4, which means its maximum magnification will be twice that of the smaller lens. Doing the math, this means that a human head would completely fill the frame at MFD.

Not noted on the release are the lens dimensions.

For those with a glutton for focal length, the 1200mm lens does take both the 1.4x and the 2x teleconverters, rendering as much as a 2400mm f/16 equivalent lens. Of course, the air column in front of that lens will chip away at sharpness. Stabilization becomes difficult at these focal lengths. At f/16, diffraction effects can rob an image of sharpness and detail.

With yesterday’s leak of product images and the details from this release, it appears Canon is putting out EF-style optical tubes, without the extra RF ring featured on other white L lenses like the 100-500 and 70-200.

Optical stabilization is rated to 4 stops (one fewer than had with the RF 600mm f/4), but that stat had an asterisk affixed to it. It has the standard three IS modes, and Canon’s most recent lens coatings.

With the weight being so similar, as well as the minimum focus distance being almost identical, one might suspect this was an RF 600mm f/4 dressed up with an attached teleconverter-like group of elements. The 1200 is to have two large fluorite elements, one Super UD element, and a single UD glass element. While the lens elements are listed and emphasized differently than was done with the release of the RF 600mm, a Canon Rumors forum member pointed out that it doesn’t eliminate the possibility that the bigger end of the lens could be largely the same as the RF 600mm f/4.

The full release, complete with weasel words and footnotes, is rumored to be coming on Thursday the 24th.

 

Stig Nygaard

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Asobinet (like digicam-info) has some more details and speculates that the new RF 800mm could "be a lens equipped with a specially designed magnifying optical system on the RF400mm F2.8 L IS USM"? Could make sense with the "metalic tube" at mount on both lenses?:
translation: https://asobinet-com.translate.goog...r_sl=ja&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=nui
 
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EOS 4 Life

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"Doing the math, this means that a human head would completely fill the frame at MFD"

My new portrait lens!
 
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mbike999

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Jan 18, 2018
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...or just buy the 400 or 600 + TCs and have a much more versatile lens. Is this really a high priority relative to a 500, 300, 200-500?

I guess it's a clever way to recycle 90% of the parts from existing optics
 
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Jack Douglas

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This is truly amazing. I'll go to sleep and dream.
...or just buy the 400 or 600 + TCs and have a much more versatile lens. Is this really a high priority relative to a 500, 300, 200-500?

I guess it's a clever way to recycle 90% of the parts from existing optics
Sorry but I see it as much more exciting than that.;)

Jack
 
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DanCarr

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It says it uses the same “front section optical design as the 600mm f/4”. I’m sure we will find out that the 800mm uses the front section of the 400mm f/2.8. It even looks like it if you look at the photos. They seem to have stuck some sort of magnifying tube/2x TC onto both of them.

Im intrigued. But it does seem like a pair of niche lenses. They will have to be a lot sharper than their original 400/600 + TC combinations for anyone to want to give up that focal length flexibility. Are there really that many people complaining about the iq of the 600mm + 2x TC? You are really fighting atmospheric issues at that focal length anyway, unless you are shooting small birds at a short distance.

I can’t wait for someone to perform some comparative tests!
 
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Jack Douglas

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I guess. I think a compact 800 PF is much more interesting versus recycling EF designs
OK, but I'm a Canonite and presently do most of my shots at 800, although F8, as is. I'd be more interested in the 800 if it's light but can't afford it anyway. That's why I dream. :)

Jack
 
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mbike999

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OK, but I'm a Canonite and presently do most of my shots at 800, although F8, as is. I'd be more interested in the 800 if it's light but can't afford it anyway. That's why I dream. :)

Jack
A compact DO lens would have been more interesting to me. That's all I'm saying. I have no doubt they will be stellar optics regardless.
 
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Stig Nygaard

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...or just buy the 400 or 600 + TCs and have a much more versatile lens. Is this really a high priority relative to a 500, 300, 200-500?

I guess it's a clever way to recycle 90% of the parts from existing optics

With custom "magnifier design" specifically made for the lens(es), the optical result should be (hopefully considerable?) better then using a "generic" 2x extender on the lens(es).
But I'm sure we will be seeing lots of practical comparisons telling us more about that...
 
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EOS 4 Life

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...or just buy the 400 or 600 + TCs and have a much more versatile lens. Is this really a high priority relative to a 500, 300, 200-500?

I guess it's a clever way to recycle 90% of the parts from existing optics
1) It would not be as sharp
2) Anyone who can afford the RF 1200 f/8 probably already has the other two
 
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Chaitanya

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A compact DO lens would have been more interesting to me. That's all I'm saying. I have no doubt they will be stellar optics regardless.
Nikon seems to have gone down that route of announcing development of 800mm f6.3 PF for their Z mount while Canon is sticking to a more conventional glass.
 

tiggy@mac.com

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It says it uses the same “front section optical design as the 600mm f/4”. I’m sure we will find out that the 800mm uses the front section of the 400mm f/2.8. It even looks like it if you look at the photos. They seem to have stuck some sort of magnifying tube/2x TC onto both of them.

My spidey sense got tingly too. That's why I went and looked up the 600mm optical design. The elements list show it's not just a TC glued onto the RF 600. Had Canon considered doing that, I don't think they'd expect to sell many, as there doesn't seem to be a downside to just carrying the 2x TC with the 600. I'm betting there's something more useful than an extended 600 to this.

We'll just have to wait for 1) the full press release to come out, 2) Canon's chosen people to give reviews where they don't directly compare image quality between this and Canon's other big whites, and then 3) wait for the supply chain to unkink enough so that some of the forum dwellers are able to get some actual time with it. So, in other words, June :(.
 
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EOS 4 Life

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My spidey sense got tingly too. That's why I went and looked up the 600mm optical design. The elements list show it's not just a TC glued onto the RF 600. Had Canon considered doing that, I don't think they'd expect to sell many, as there doesn't seem to be a downside to just carrying the 2x TC with the 600. I'm betting there's something more useful than an extended 600 to this.

We'll just have to wait for 1) the full press release to come out, 2) Canon's chosen people to give reviews where they don't directly compare image quality between this and Canon's other big whites, and then 3) wait for the supply chain to unkink enough so that some of the forum dwellers are able to get some actual time with it. So, in other words, June :(.
There would be no reason to ever do that.
It would make more sense for them so sell a 600 with a built-in 2x teleconverter unless people would be dumb enough to pay more for a 1200 f/8 that is no better than a 600 f/4 with a 2x teleconverter.
 

koenkooi

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There would be no reason to ever do that.
It would make more sense for them so sell a 600 with a built-in 2x teleconverter unless people would be dumb enough to pay more for a 1200 f/8 that is no better than a 600 f/4 with a 2x teleconverter.
I would hope that a built-in, non-removable 2x TC that is designed for that specific lens would give better image quality than using the external, 'generic' 2x TC.
Having said that, I don't know how much improvement you could get when doing that and this is more about having fewer moving parts on a huge, heavy lens.
 

LDS

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Sep 14, 2012
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When you mount a TC on a lens, aperture diffraction doesn't change for a given aperture size, the light loss is not caused by a smaller size of the diaphragm hole. Just like it doesn't change if you mount an ND filter. Then there are the TC own effects, and it can't create resolution where it does not exist.
 
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justaCanonuser

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Feb 12, 2014
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"Doing the math, this means that a human head would completely fill the frame at MFD"

My new portrait lens!
for portraits with eyes widened in fright, because the look in the dark mouth of this huge white bazooka :devilish:

now, for birders, they will have to decide whether they go for a 600mm f/4 plus 2x TC to be a bit more flexible or get the new 800mm. It'll also depend how well the latter one will work with TCs to get even more reach (and often catch more details of atmospheric blur :p)
 
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