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R5 IBIS doesn't work with EF lens IS?
- Thread starter Steve Balcombe
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thunder storm
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Canon won't do this, as it is too risky. Doing this will come at the cost of loosing market share. There's always the MC11 or Metabones, and once a Sony body has arrived Canon might actually sell less lenses.
Steve Balcombe
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Yes. I wish now that I'd written "cooperate with" rather than "work with" in the OP subject line, it would have been clearer what I meant.
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John Sheehy
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System can't blindly engage two independent stabilization functions. If they overlap in their corrections, they uncorrect the corrections, while adding two sources of jitter (imperfections in the stabilization). In order to have lens IS and IBIS on at the same time, the system must be able to assign individual aspects of correction to only one of the two stabilizations. So, IBIS could only work in conjunction with Canon's single-instruction EF lens IS by IBIS only using motion corrections not addressed by the lens IS.
I'm not sure if Canon EF lenses tell the body that the IS is even used, so the body may only allow IS power or not allow it, while never knowing if it is even used.
after reading alot of patents, it's more than that. the lens actually tells the camera the real time position, so that the IBIS in camera knows how to compensate, and also knows when it's getting close to the absolute image circle of the lens.
So there's A LOT of proprietary conversations between camera and lens to get IBIS+IS to work at least in the model that Canon is using.
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Steve Balcombe
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I posted about that somewhere - IS on/off and Mode are not in the EXIF data, even with the most recent EF bodies and lenses, which suggests (but doesn't prove) that the information is not communicated.
Having had a bit more time to think about this, what it will boil down to for me is the need to switch painlessly between the different lens/body IS permutations, and in a way which I am unlikely to forget to do when switching lenses in a hurry.
I am sure Canon will have provided a solution - I just hate being in this position of not knowing!
My suspicion is that IBIS + IS was one of the big reason canon didn't use the EF-M mount and went with the high speed RF mount design.
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I would already be very happy if Canon would allow roll correction if the IBIS can't work together with the lens IS.
The big question for me will be whether or not an M with IBIS in 2020 will be enough of an upgrade over my M6II to justify buying it.
Lawn Lends
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It should work with the RF 28-70 2.0, dont see why it shouldn't work with older adapted Canon or third-party non-is lenses
Steve Balcombe
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The April 20 press release appears to say something different - and very encouraging (my emphasis again):
"A Canon first, the EOS R5 will feature 5-axis In-Body Image Stabilization, which works in conjunction with Optical IS equipped with many of the RF and EF lenses."
5-axis IBIS cooperating with the hybrid IS in my 100L Macro could be very handy for those arm's-length one-handed insect shots!
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ZX11
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I think Canon's IBIS works with all its lenses. Even the EF-S lenses. It is the stops of stabilization that is improved with RF lenses since they have extra communication channels to tell the body what the lens is doing.
Didn't they just make the R5's sensor smaller than the EOS R's so there is room for it to move around (IBIS) in the image circle. You can't move the R's sensor around because it would move outside the image the lens is projecting into the camera. The R's sensor covering the full image the Canon lenses project. So a new smaller sensor for the R5.
Call the R5 sensor 7/10 of full frame?
Where did they state that it's smaller? They've always said full frame, not APS H
thunder storm
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If i read it well, even the conjunction of IBIS and IS will work with some EF lenses too, regardless the (lack of) extra communication channels.
Not always a benefit to have a smaller sensor, but at least it's a small step towards an RF 7D
. Canon is always crippling. It's either no IBIS or no full frame.
ZX11
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By crippling, I assume you mean always building fantastic systems that keep it the number one camera system. I wonder how much smaller it needs to be to be able to bob and weave but stay within the image circle. I'm sure it will still count as full frame. But, some youtuber will investigate and discover it doesn't quite have the bokeh at each f-stop it should for a full frame. At least compared to other Canon FF cameras.If i read it well, even the conjunction of IBIS and IS will work with some EF lenses too, regardless the (lack of) extra communication channels.
Not always a benefit to have a smaller sensor, but at least it's a small step towards an RF 7D
Canon is always crippling. It's either no IBIS or no full frame.
It is all just speculation on the R5 like everyone is doing. Have to wait and see what it can really do.
ZX11
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Speculating as everyone is doing on the R5. Nothing released about the sensor details.
If the sensor is moving a few millimeters to one side and to the other for stabilization, it needs room in the image to move. The R's sensor covers the image circle so there is no room to move (and it's is mounted firmly). The R5's sensor will likely still self identify as full frame :-D
"full frame" has always meant the same thing to Canon. Aside from that, Canon has photos on their website of the camera that show the sensor. A glance at the R5 next to the same front-on photo of an R show the same sensor size.
The presumption you're making is that the image circle of RF lenses is precisely. According to Canon's "Lens Work III," the usual image circle of EF lenses is 42.3mm (58.6 for the TS lenses). But that's not a hard cutoff, that's the diameter for which Canon designs acceptable corner sharpness and transmission.
We don't know that Canon hasn't designed RF lenses for a larger image circle. Of course, that would make for a more expensive lens...which RF lenses are.
thunder storm
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