With telephoto focal lengths as long as these lenses have, I probably would wait for other versions that add IS.
It could be the same size as a Tamron 150-600mm or a Sigma 150-600mm C with their f/6.3 at the long end, and both are under 2 kg.
The patents make it pretty obvious that there is no IS in the lens.
I would agree that removing IS would reduce the weight & cost, but I'd be surprised if it was enough weight reduction relative to the heavy weight of the lens to make much of a difference. I would also assume the same regarding cost versus the total cost, since Canon has put IS in so many of their lenses.
EOS R with Sigma 60-600 work well together. For steady or slow moving birds there is absolutely no problem and AF is consistant and fast. The only thing that can become an issue is EVF that lags behind, so it struggles with fast moving birds but it works well if the focus is locked.
That is their mental problem.
not so true. we've found RF super telephoto patent applications.
That is true, but compared through 400mm the f4 should be better and for 560mm @f5.6. There is no comparison above 560mm where the new lens will win without question!
Update: it just occurred to me that I can pop on my 2x, not engage the internal TC and have a 400-800@f8 to compare with new lens. It will be interesting to compare the image quality between the two lenses. I think the 700mm might win because the glass is internal versus having a TC in the loop. I have used this setup and the image is actually pretty good.
