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Inventory Discover: Canon RF 400mm f/2.8L IS USM & Canon RF 600mm f/4L IS USM | Canon Rumors

Hello everybody. I’ve adopted Canon Rumors since means again within the late 2000s and love the positioning and the discussions, however by no means actually thought I’d remark myself – till now.

The unique submit concludes “The EF variations of those lenses will not be able to this function”, referring to “Twin Energy AF” I count on. Can anybody present additional info/sources to verify present technology EF superteles will not be able to this?

There may be some info on this article on the Canon Europe web site:

I’ve come throughout different snippets too, however there appears to be ambiguity about whether or not the RF superteles and R3 have a model new function in Twin Energy AF or whether or not that is successfully the identical because the 1D sequence and EF superteles have already got. It might simply be the primary look of it within the R ecosystem.

I do know the LP-E19 battery with its larger voltage is one key consider driving the main focus of superteles sooner than when used on decrease tier our bodies. Additionally, the R mount has 4 extra electrical contacts than EF, however they’re for enhanced communication. Each the LP-E19 and huge optical teams in superteles are widespread to each EF and R ecosystems and I’m undecided what to imagine.

A comply with up query: If EF variations of latest RF superteles will not be able to receiving extra energy for the autofocus motors from the R3, will they give attention to the R3 with related pace as on the 1DX III – certainly not slower??

In any occasion I’m hoping manufacturing R3 opinions will embrace comparisons of focus speeds, for instance between the identical EF supertele (present technology) on each an R3 (tailored) and on a 1DX III, in addition to between EF III and RF variations of the identical supertele on an R3.


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