Canon Rumors reader Ivan sent in a mockup that shows the size difference between the RF 24-105mm f/4L IS and the revolutionary RF 28-70 f/2L. The latter is definitely going to be a big lens, but maybe not as big as we originally thought.
The Canon RF 24-105mm f/4L IS has the following measurements:
- Size: Approximately 83mm (3.26 inches) x 107mm (4.2 inches)
- Compared to the EF 24-105mm f/4L IS II 83mm (3.26 inches) x 118mm (4.64 inches)
- Weight: Approximately 698g (1.5lbs)
- Compared to the EF 105mm f/4L IS II 795g (1.75lbs)
As with any mockup such as this, it may not be 100% accurate.

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I don't see any IS markings on the lenses, so we're hoping that the EOS R has IBIS, but we haven't seen confirmation of that yet. I could understand the argument of the RF 28-70mm f/2 not having IS, but not the RF 24-105mm f/4L.
drool...
Anyone going to guess a price before Wednesday?
I'd price it out in the ballpark of the 11-24mm F/4 (which I suspect is similar in size and weight) at $2,999
Canon never pours all the good candy in the same bowl. The EOS R we've just heard about will be an "entry-to-medium level" 6D-type of camera with up-to-date specs but with no IBIS. This so that they can lower the cost and price it accordingly. They bundle it with the 24-105 IS and 35 1.8 IS in order to compensate for the missing IBIS. Future RF lenses aimed at this body will likely include IS.
On step up and we are in L-territory. The 28-70/2 and 50L do not have IS since it would make them even bigger (especially 28-70). These lenses are most likely designed with another body in mind. In fact...I think it will look extremely strange...plain wrong to put that f/2 zoom on the little EOS-R. I am sure Canon has something else in store. A more professional ML with joystick AF, dual-card slots, higher resolution and of course...IBIS.
This might be a surprise for the 5th release or something they will mention as an upcoming model down the road.
I completely agree. It's a soft opening for Canon FF mirrorless market. Once they release their professional 5D like body, I'm sure they will add another batch of lens. That is the camera that will turn head.
BTW, with Canon having 70-130 f2 patent, I can see them remaking a trinity lens 14-28 F2, 28-70 F2, 70-130 F2 ***DROOOL****
Nice comparison! Thank you for adding it. To be honest, that 50L seemed very tempting, but it’s size is a bit off putting to me. It seems bigger than the EF 50L, which measures 85,8 x 65,5mm. I hope I am wrong.
Yikes! :(
I guess, we have to think of it in terms of Sigma 105/1.4 sizewise.
So are EF lenses a dead along with DSLR's 10 years from now? That will be sad, and bad news for a lot of EF lens owners.
I still hope that Canon will make a ML/ILC with native EF mount
I'll say those leaked sizes seemed off to me. I matched them up visually by the size of the mount first and then tried to extrapolate the size of the 28-70mm from the scale of the others and it was off from the listed lengths.
I'm guessing maybe it's a multi function ring so can assign lots of different functions sort of like the M-Fn button. If so, that's really cool.
I guess we will know the 5th. Fingers crossed.