Sorry. I am afraid that I have failed to Defend my point.Big difference between 70-135 and 70-180.
An RF 70-180 f/2.8 (non-L) would face stiff competition from the sure-to-come RF 70-200 f/4L.
The size and weight was the major factor when decided between 70-200/2.8 and 70-200/4.
It was a compromise for many.
with a smaller 70-180/2.8 this is no longer the case for many.
With 70-135/2.8 the size and weight of the lenses can be further reduced down to around 400gr.
A compact and light travel lenses. Excellent for controlled studio light portraiture when shooting stopped down anyway. Or even for candid flash assisted portraiture when shoot stopped down.
Personally, I favour 70-180/2.8 over 70-200/4 any day. an extra stop advantage is indispensable in low light run and gun situation. I can see myself sacrificing the 180-200 end easily for an extra stop of light and a substantial size and weight reduction. Especially that with 45Mp sensor of R5 cropability would be an unlikely issue.
And finally, RF 70-135/2.8 would be a relatively inexpensive lens. Even from Canon.
p.s. https://photorumors.com/2020/04/03/...ny-e-mount-to-be-announced-next-week/#respond
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