Patent: Canon RF 70-200mm f/2.8L IS USM

padam · Jan 3, 2019

Looks like 18 elements instead of 23 in the last EF versions, so it will be lighter. (typo edited)

colorblinded · Jan 3, 2019

I count 18, which is still a nice reduction.

twoheadedboy · Jan 3, 2019

Are the 3 numbers suggesting the lens will extend at longer focal lengths, reaching a max of 242mm at 200mm focal length? That would be about 1.7" longer than the current model.

mclaren777 · Jan 3, 2019

Given how great the adapter is, I don't see myself buying any native lenses that mimic EF lenses.

In fact, I could see my 28-70mm being the only RF lens I own through 2020.

rsdofny · Jan 3, 2019

I thought the bigger RF lens mount allows the lens designer to move the heavier lens elements towards the side of the body. So Canon has not explored that design concept here.

sid.safari · Jan 3, 2019

What are the potential advantages in using the RF 70-200 f/2.8 over the recently released EF 70-200 f/2.8 III? Would the AF be faster? I don't get why Canon releases the 70-200 III and then another almost similar version a year later (albeit for the RF system)

Pooshoes · Jan 3, 2019

sid.safari said:

The III is just a soft refresh of the II version which came out a long time ago, the RF sounds like a brand new design. Lighter, shorter, and presumably sharper and faster focusing. Can't wait to see what comes out of Japan this year!

JonSnow · Jan 3, 2019

as landscape guy i don´t want or need a heavy f2.8.
hope they will release a RF 70-200mm f4 IS soon too.

when the highend mirrorless comes out i will buy it.
the EOS R is unfortunately nothing i would want beside my 5D Mk4.

JonSnow · Jan 3, 2019

rsdofny said:

or you just oversimplify things....

i wonder more that there is no mentioning of IS.
is this normal for a lens that would have IS, to not be mentioned in the patent?

Antono Refa · Jan 3, 2019

JonSnow said:

L2, just in front of the aperture, is marked as IS.

Then again, I might be reading the diagram wrong, as it seems to me there's a second aperture marked as SSP.

Viggo · Jan 3, 2019

rsdofny said:

The RF mount still isn’t any bigger than the EF mount...

JonSnow · Jan 4, 2019

Antono Refa said:

lol.... could have sworn that was not there yesterday... i did not see it.

rsdofny · Jan 4, 2019

Viggo said:

https://www.canonrumors.com/the-benefits-of-the-large-diameter-of-the-eos-rs-rf-mount-explained/

This is the article that talks about the advantage of RF lens design. It makes a lot of sense to use this design philosophy for long white lens to achieve a better balance, perhaps shorter and lighter lens along with other benefits.

Maximilian · Jan 4, 2019

I hope, we'll see this lens soon as I am very curious how this will perform compared to the EF zoom.
I am also really surprised that Canon changed the design, as the EF was already outstanding.
Does this just mean saving production costs with less material or will there be an improvement of IQ as well?
Or is the reason the extending lens design?

Viggo · Jan 4, 2019

rsdofny said:

I know the benefits, but it’s still the same 54mm size as EF...

Maximilian · Jan 4, 2019

twoheadedboy said:

There are different numbers to understand.
The "Length of the zoom lens" (172.73, 227.50, 242.86 mm) is the overall length of the optical formula from first (the front) element to the image plane. As we have a flange distance of 20 mm for the R system, the mechanical length of the lens barrel should be about (243 - 20 =) 213 mm. As we have three numbers this lens will probably have an extending lens barrel.
And this could be a reason for the different optical formula: saving barrel length if possible for a smaller system as the R system is.

The other three numbers (BF: 14.38 26.45 39.44 mm) is the distance between last lens element and the image plane.

neuroanatomist · Jan 4, 2019

BigAntTVProductions said:

I suspect there are many competent photographers who could use the EOS R successfully for sports photography, even if you’re not among them. Granted, it’s not the best choice in cameras for that use case, IMO, but still...

3kramd5 · Jan 4, 2019

neuroanatomist said:

You didn’t seen the firmware patent for the EOS-R where it uses subject recognition to disable the camera in a sports setting?

dwilz · Jan 4, 2019

neuroanatomist said:

I have a 1Dx which I shoot college soccer. I shoot the games as a hobby and give the images to the kids. I have used the EOS R to shoot the last 2 games of the 2018 season. While it's true that you can't rely on fps to get you the perfect shot I found that I was getting pretty good shots with the R. I should add that this late in the season they were night games.

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