p.2 #1 · Canon Says it’s up to Sigma to Make Full-Frame RF Lenses
campy wrote:
I checked it out and it says to remove the lens you need to press the button on the lens and not the camera. Is that their way of getting around the restriction?
No, that's how the lens mount is designed. In practice, it has not been an issue for me.
p.2 #2 · Canon Says it’s up to Sigma to Make Full-Frame RF Lenses
EB-1 wrote:
There is a difference between blocking or having a licensing agreement. It's pretty clear in the Canon statement that they will license RF and RF-s not differentiating by image circle. It may be a high price for Sigma on RF so they chose not to. Maybe there was some new contract reached, but who knows. In the past Sigma said they did not need the Canon RF market as they were at capacity, but that may not be accurate now. RF market may be increasing as old DSLRs and users die out, the newer folks are going to be RF users.
Yes, I think the article in Canon Rumors treated the same speculation. Canon *may* want too much money to make it profitable.
Or, Sigma may not yet see an opportunity. Comparatively, they are not a big company, and RF full frame does not have nearly so many obvious holes in the lineup. Between EF and RF glass, full frame lenses for Canon cameras are pretty abundant, and EF glass can be cheap. They may simply be waiting for the RF market to mature. Or, they may not think they can ramp up manufacturing capacity appropriately.
p.2 #4 · Canon Says it’s up to Sigma to Make Full-Frame RF Lenses
Alan Kefauver wrote:
Somebody....somewhere.....some how.......Give me a 24mm or 90mm Tilt-Shift Lens in an RF mount!!!!!!
Adapt them? I doubt Canon is in a hurry to revamp their longer TS-E lenses, though the wider ones could certainly use an RF native refresh with the shift and tilt electronics for corrections that Fuji put in their MiniMF 30mm TS lens.
p.2 #6 · Canon Says it’s up to Sigma to Make Full-Frame RF Lenses
Sorry, laowa has a 55 and 100 t/s lens
Apr 03, 2026 at 08:16 AM
Steve Spencer Offline • • • • • • • Upload & Sell: On
p.2 #7 · Canon Says it’s up to Sigma to Make Full-Frame RF Lenses
gwaww wrote:
Sorry, laowa has a 55 and 100 t/s lens
Yes, but the RF mount versions have no electronics so no triangles for focus aids. Some might prefer EF mount on the these lenses and use the EF to RF converter to get the focus aids.
p.2 #9 · Canon Says it’s up to Sigma to Make Full-Frame RF Lenses
I hope they open it up to sigma. I need someone that does more than gee wiz video lenses or "price competative" lenses.
Apr 03, 2026 at 11:37 AM
Steve Spencer Offline • • • • • • • Upload & Sell: On
p.2 #10 · Canon Says it’s up to Sigma to Make Full-Frame RF Lenses
gwaww wrote:
So you didn’t really mean…. Somebody…. Somewhere….. somehow…… Aren’t focus aids in the camera body?
The triangle focus aids on Canon bodies use the AF system and require electrical contacts. Many lenses that aren't RF mount can bring up this focus aid, which is my favorite focus aid and many people seem to like it. If a lens has an RF physical mount but no electrical contacts it won't bring up this focus aid. If a lens has an RF mount with electrical contacts it will. If it has an EF mount with electrical contacts it wll bring up this focus aid if you use the EF to RF Canon converter. If you can adapt the lens to Leica M mount or it has a Leica M mount and you use the new Shoten Leica M to RF adapter you will get this focus aid. So there are lots of ways to get this focus aid. You just can't get it with an RF mount without electric contacts.
Other focus aids, (e.g., peaking and magnification) don't require electrical contacts, so a lot depends on how you like to work and which focus aids you prefer. Personally, I much prefer that a lens has the triangles as a possible focus aid.
p.2 #11 · Canon Says it’s up to Sigma to Make Full-Frame RF Lenses
I don't even want to contemplate the horror of using a primitive lens like in the 1970s or early 80s with no electronics at all. Sigma should give us RF lenses with fast AF and good OS like the best modern Canon RF lenses.
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p.2 #15 · Canon Says it’s up to Sigma to Make Full-Frame RF Lenses
EB-1 wrote:
That 500/5.6 does look nice. The optical diagram looks like it should work with a TC and also extension tubes.
EBH
The L mount versions work with TCs. It is just the licensing agreement with Sony that prevents TC use with this lens. Hopefully Canon in any agreement with Sigma wouldn't cripple the lenses like Sony has done. In addition to no TC useage, third party lenses (including Sigma) are limited to 15 fps.
Apr 04, 2026 at 02:54 AM
Steve Spencer Offline • • • • • • • Upload & Sell: On
p.2 #16 · Canon Says it’s up to Sigma to Make Full-Frame RF Lenses
dolina wrote:
Sigma lenses I'd want to see on RF mount
For the 15 f/1.4 do you mean thr 15 f/1.4 full frame fisheye lens or do you mean the 15 f/1.4 APS-C image circle lens. The APS-C image circle lens is already available on Canon RF mount. Or perhaps you mean the 14mm f/1.4 which is not a fisheye and has a stellar reputation for astrophotography.
p.2 #17 · Canon Says it’s up to Sigma to Make Full-Frame RF Lenses
garyvot wrote:
No, that's how the lens mount is designed. In practice, it has not been an issue for me.
Then what would be the reason for doing that? The button has to push the tab on the camera anyway.
Apr 04, 2026 at 07:39 AM
Steve Spencer Offline • • • • • • • Upload & Sell: On
p.2 #18 · Canon Says it’s up to Sigma to Make Full-Frame RF Lenses
campy wrote:
Then what would be the reason for doing that? The button has to push the tab on the camera anyway.
We can only speculate, because it doesn't make a lot of sense from a design standpoint, but perhaps they did it to aid their argument that they aren't violating Canon's patent for the RF mount.
p.2 #19 · Canon Says it’s up to Sigma to Make Full-Frame RF Lenses
Steve Spencer wrote:
For the 15 f/1.4 do you mean thr 15 f/1.4 full frame fisheye lens or do you mean the 15 f/1.4 APS-C image circle lens. The APS-C image circle lens is already available on Canon RF mount. Or perhaps you mean the 14mm f/1.4 which is not a fisheye and has a stellar reputation for astrophotography.
p.2 #20 · Canon Says it’s up to Sigma to Make Full-Frame RF Lenses
Steve Spencer wrote:
The L mount versions work with TCs. It is just the licensing agreement with Sony that prevents TC use with this lens. Hopefully Canon in any agreement with Sigma wouldn't cripple the lenses like Sony has done. In addition to no TC useage, third party lenses (including Sigma) are limited to 15 fps.
I was not sure about the diameter of the recess in the lens.
The TC issue has not affected me yet as an a7r series user, but it probably will at some point.
I suspect that Canon will be either allow full speed or not. If a Canon 1.4x TC is not feasible I'm not interested unless there is a very good dedicated Sigma 1.4x TC. The 300-600/4 is a bit too large for my consideration.
Sigma should give us RF lenses with fast AF and good OS like the best modern Canon RF lenses.