Canon Patents

Patent: Canon RF 24-70mm f/2.8L USM

Northlight has uncovered a USPTO patent that shows an optical formula for an RF 24-70mm f/2.8L USM along with the already released RF 28-70mm f/2L USM.

Canon RF 24-f/2.8L USM Patent Specifications:

  • Focal Length: 24.69mm 37.63mm 67.88mm
  • F-Number: 2.91 2.91 2.91
  • Half angle of view (degrees): 41.23 29.90 17.68
  • Total length of zoom lens (mm):  139.21mm 150.29mm 171.74mm
  • Backfocus: 13.49mm 22.31mm 35.10mm

The RF 24-70mm f/2.8L USM is expected to be announced sometime in 2019, maybe even as soon as CP+ in February.

Apr 1, 2016
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#2
Seems like a logical move. That is, if a pro-oriented body is coming somewhere in '19 too. Of course this would to well on the R, but I don't consider this a typical pro body.
 
#3
Maybe not the compact walkaround lens BUT I am very shure that it will give great if not spectacular IQ at a high but reasonable price.
The back focus at 24mm of only ~13mm might exploit the "missing mirror box effect" to increase the IQ notably without gaining to much pricewise / sizewise.
If this again is without IS I see a good chance for an IBIS equipped EOS Rxyz body (and with 2 card slots!).
 

Pape

I'm New Here
Dec 31, 2018
17
2
#10
no need make new design ,with most new materials and more advanced lens grinding methods it will be better. image stabilazing good for hobbyists, pros wont take pics for fb only
 

flip314

I'm New Here
Sep 26, 2018
22
8
#11
I'll be really disappointed if they release another 24-70 2.8 without IS... For me personally an RF 24-70 2.8 IS would be enough to get me into the R system, otherwise I'll probably stick with EF for now and give in and buy the Sigma.
 
Likes: LesC
Sep 17, 2010
801
112
#13
Very odd. This is longer than the current EF 24-70 II. About 20+ mm. If this lens is released, it will negate any "size" advantage of the R camera bodies.
 

flip314

I'm New Here
Sep 26, 2018
22
8
#14
Very odd. This is longer than the current EF 24-70 II. About 20+ mm. If this lens is released, it will negate any "size" advantage of the R camera bodies.
I wish the whole "mirrorless needs to be smaller" notion would die. For a lot of people, the advantages of mirrorless have nothing to do with size, and we like the ergonomics of substantial bodies. I think there's a market for small mirrorless, but I don't think EVERY mirrorless body and lens needs to be smaller.

Incidentally, 20mm is about the difference in flange sizes between the mounts... So I'd imagine the entire lens+camera is the same length in either system, which is fine by me. For telephoto lenses (70mm is entering that territory), that's almost inescapable.
 

Maximilian

The dark side - I've been there
Nov 7, 2013
2,271
149
Germany
#15
Very odd. This is longer than the current EF 24-70 II. About 20+ mm. If this lens is released, it will negate any "size" advantage of the R camera bodies.
Once again:
The "Total length of (zoom) lens" in a patent means the length from front element to image plane/sensor.
To get the "mechanical" length of the lens barrel you'll have to subtract the flange distance (EF:44 mm; RF: 20 mm)

Here the total length of this zoom lens (mm): 139.21mm 150.29mm 171.74mm

In 24 mm FL position this lens is (139-20=) 119 mm long. The EF lens is 113 mm long. So both about the same size.
In 70 mm FL position this lens is (172-20=) 152 mm long. For the EF lens I hve no numbers here.
 
Likes: docsmith
Sep 17, 2010
801
112
#16
Once again:
The "Total length of (zoom) lens" in a patent means the length from front element to image plane/sensor.
To get the "mechanical" length of the lens barrel you'll have to subtract the flange distance (EF:44 mm; RF: 20 mm)

Here the total length of this zoom lens (mm): 139.21mm 150.29mm 171.74mm

In 24 mm FL position this lens is (139-20=) 119 mm long. The EF lens is 113 mm long. So both about the same size.
In 70 mm FL position this lens is (172-20=) 152 mm long. For the EF lens I hve no numbers here.
There we go...thanks...now looking at the image, it clearly goes back to the image sensor.

I wish the whole "mirrorless needs to be smaller" notion would die. For a lot of people, the advantages of mirrorless have nothing to do with size, and we like the ergonomics of substantial bodies. I think there's a market for small mirrorless, but I don't think EVERY mirrorless body and lens needs to be smaller.

Incidentally, 20mm is about the difference in flange sizes between the mounts... So I'd imagine the entire lens+camera is the same length in either system, which is fine by me. For telephoto lenses (70mm is entering that territory), that's almost inescapable.
I didn't say it needs to be smaller. Bigger is what caught my eye. Even with the correction from Maximilian (thanks again), I would expect this RF lens if built is still just a bit longer than the EF version. Granted, in my original post I was thinking ~1" vs ~1 cm (adding a few mm for constructed length).
 
#18
There must be IS, else is useless for video...:confused:
As I said above: For me these IS-less RF lenses are a strong indication that Canon will introduce an IBIS enabled body for the EOS R system very soon. Further speculation of mine: It will be a larger pro body where heat dissipation is easier to manage by sheer mass of functional and constructive elements.

The EOS R system exploits the full advantage of having no mirror to place lenses just in front of the sensor. If I look at the above lens patent it is full of glass - no space for IS elements without sacrificing optical quality. For me it is logical that Canon optimizes the lower focal length lenses optically and adds IS with ONE body for ALL lenses. They cannot omit this essential feature for a longer period.

While I am satisfied with the APS-C near-equivalent of the RF 50 1.2, the EF-M 32 1.4, I am lusting for a modern full frame body where I can use (1) my EF lenses which have no IS except one lens, (2) my older FD lenses and (3) use them all stabilized with IBIS.
And I hope for IBIS in EOS M bodies to make use of my EF-M 32 under just lower light conditions than now.
 
Likes: qudek77

Architect1776

Defining the poetics of space through Architecture
Aug 18, 2017
100
73
117
Williamsport, PA
#19
Canon took old camera and old lenses changed EF to RF and added 40% to the price.
Most innovative company in the world.
Troll. Canon is still decades ahead of the others in overall design and innovation. They are still trying to catch up with EF let alone RF. Sony is saddled with an APSC mount smaller than the M mount and to make a large aperture lens will require huge and heavy front elements and loss of IQ compared to the RF and for that matter the Z mount now (30 years late though).
 

Architect1776

Defining the poetics of space through Architecture
Aug 18, 2017
100
73
117
Williamsport, PA
#20
I'll be really disappointed if they release another 24-70 2.8 without IS... For me personally an RF 24-70 2.8 IS would be enough to get me into the R system, otherwise I'll probably stick with EF for now and give in and buy the Sigma.
It looks like the future R series will have IBIS negating the need for in lens IS which will allow them to be smaller and less complex internally. I welcome this path as I know canon will do it right having looked at others failures and making the proper corrections that will not please the trolls but will be great.