When will Sigma and/or Tamron produce RF lenses?

William Woodruff wrote:

tobicy68 wrote:

Maybe Tokina will be the first to release, they just announced the 85mm F1.8 for Sony FE. It will be a good budget alternative to the 85mm F1.2.

But then again it'll still be competing with adapter + EF 85mm F1.8. The size of not requiring the adapter is a plus but if you already have a EF 85mm F1.8 I don't see the average user would go get another lens thats extremely similar.

It will be interesting to watch and see how well the independents adapt lenses from mount to mount. Both Nikon and Canon have made their new lens mounts larger -- significantly larger than Sony. It is claimed (by Canon especially) that this permits different -- and significantly better -- optical formulas. If that is the case, the independent lens makers are faced with the choice of either optimizing new lenses for one camera, and adapting it as a less-than-optimal lens for the other two mounts; or building uniquely optimized lenses for each camera brand.

Yeah that's not much of the choice. it will be one size fits all.

The other issue is going to be lens to camera communication. That is an increasingly complex process, and when adapting one lens across multiple brands it may be difficult to provide full functionality, even if the lens maker fully understands a particular brands' communication protocols.

IBIS may be more difficult but the Nikon Z protocol was totally busted a long time ago.  Seems the RF one may be taking longer as the Samyang seems to be EF based.