How many stops Canon EOS R6 or R7 IBIS produces with no IS lens?

John Sheehy wrote:

bodeswell wrote:

Abhik Bose wrote:

I am planning to upgrade to Canon EOS R7. I have a few old EF lenses with no Image Stabilisation (IS). I want to use those lenses also with EOS R7 using an adaptor.

I want to know how many stops R7 In Body Image Stabilisation (IBIS) will give with those lenses having no IS.

You will definitely notice the benefit. I also have several old Ef lenses. As for how many stops, exactly, that depends on us I suspect. Canon doesn’t actually make a specific claim for old lenses as far as I know. I get about four stops based on totally unscientific impressions with my old 135 and 200 L primes. Your mileage may vary. Stop worrying and enjoy it. You will get more stops!

You definitely will be able to use a slower shutter speed for images with modest or low magnification, but stabilization is not perfect and can add some small blurs at the same time that it is correcting larger ones, so it is possible that stabilization helps a lot less with high display magnification or even ruins some frames, but greatly aids with low magnification. With the initial firmware for the R5, this seemed to be the case with X/Y translation added to OIS EF lenses. I would only get 1 out of 4 images in a burst tack-sharp at 100%, with the same EF OIS lenses that gave 4 out of 5 pixel-sharp captures on my 90D, despite the 90D revealing blur more clearly with its higher pixel density.

IOW, stabilization can potentially be like being on a tripod, but on a tripod that is getting some small shocks or vibrations. The CIPA standards do not, therefore, give any guarantees for people cropping hard or making very large images.

I have seen people claim IBIS gets you 2-4 stops.   This is consistent with the informal testing I have done with R7 and R5.   I have 14 L EF lenses.  Many of them have no IS. I feel they all benefit in the 1-4 stop range but hard to precise in this because it depends on how stable you are with no IBIS as well and on the performance of the IBIS.   It is possible with IBIS alone to get down to 1/4 second or better.  You would wise to shoot several shots and pick the best one though.