Canon will be announcing the Canon RF 70-200mm f/4L IS USM alongside the Canon RF 50mm f/1.8, which leaked earlier this week.
For scale, here is a size comparison between the RF 70-200mm f/4L IS USM and it's big brother, the RF 70-200mm f/2.8L IS USM.
Both of these lenses have been long-rumored and should be big sellers for Canon. I expect an official announcement from Canon early next week.
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This will be a fantastic hiking or trekking lens! Curious about the price though...
Which one is supposed to produce better images: f/2.8 lens set on f/4 or native f/4 one?
Probably it will be the "little sibling" like the EF 70-200 F4 L. That old EF lens has great image quality. All RF lenses are very sharp, so probably this new one will be great too in all aspects. The main decision should be other factors like budget and use case.
Canon to announce the RF 50mm f/1.8 STM and RF 70-200mm f/4L IS USM soon
I guess you never took a hike with you F2.8 collection. The EF F4 L lenses were built with the same quality but half price and half weigth. I would not expect this to be any different.
The AF is supposed to still be working at f/8, no ? If it is f/5.6, then you might use a 1.4x one...
When I bought my EOS R I also bought the RF28-70mm f/2, a simply gorgeous lens (if a bit heavy). I like the idea of the RF 70-200mm f/2.8, it seems like the natural complement to the 28-70. But I just can't justify spending $2600 (or more) for every lens. I'm thinking that with the IS and the ISO capabilities of the EOS R this lens will suit my needs...assuming it sells for about $1000 less than the f/2.8.