We just got word that the new Cinema EOS zoom lenses will be a 20-50mm and a 45-135mm, with an aperture wider than the current zoom maximum apertures (f/2.8).
Mounts will be EF and PL, as expected. The image circles will be a bit wider than full frame so as to accommodate various video sensors that are slightly larger, such as the VistaVision format employed by some RED and Panavision cameras.
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I would love a 24-105 t/4.4 full frame compact servo zoom to go with the 70-200.
This is cinema glass, not the "regular" photo lenses. Most C-branded cameras are EF mount and still actively being sold. Other camera manufacturers also work with EF mount natively. Lens is easily adapted/switched to PL which is used by even more cinema and ENG camera bodies.
I'd love to start seeing RF cinema glass, but think we're several years away.
I think the real reason is that the cinema industry is running with PL mount and EF mount and if you design a lens for PL mount the flange distance is large enough for EF mount.
Use an EF - EOS R adapter with e.g. R5c is (1) cheap and (2) gives you the flexibility to use ND filters (variable or filter revolvers).
I bought the EF 16-35 to be backwards compatible with M50 (ii) and maybe to use it on the classic 5D while paying roughly 55% of the price of the EF 14-35 which has more range and maybe the sharper optics AND to use ND filters in an adapter!
Is it size? Canon has made it obvious that RF lens designs on average don't save any weight and size over EF versions.
I can see a niche market of solo operators who'd like AF/servo lenses that are parfocal with zero focus breathing (myself included). Targeting the R5/C70 crowd. But still, an EF version just gives the owner so much more flexibility with camera packages and ND adapters.
Canon should simply state that RF is it's still/photo line of lenses and that EF/PL will remain it's cinema line. And then release a line of very robust cinema-grade adapters for future RF mount cinema cameras akin to the 0.71x reducer. A passive mount, ND option, etc. all with 4x bolt-in points to quell any fears about adapter play.
RF cinema glass = great idea if Canon doesn't want to sell many.
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