When will Sigma and/or Tamron produce RF lenses?

Great Bustard wrote:

Peter Kwok wrote:

The easiest way is to redesign the current EF mount lens as RF mount lens, by making the barrels longer in place of an adaptor, resulting in a collection of lens that is slightly longer and heavier. However, until Canon sells substantially more R bodies than DSLR, they will only be available in EF mount.

Both Sigma and Tamron have a line of lens for Sony FE mount. Putting them in RF mount can take advantage of the shorter flange distance. Given both companies know how to build AF lens for Canon EF mount, it is easy to release them as Canon RF mount. To a Canon R body, they will appear as a 3rd party EF mount lens on an adaptor. These will most likely be the first native RF mount lens available. Samyang is already doing it.

None of these can take advantage of the larger RF mount diameter or the high speed link provided by the two extra pins. I will not hold my breath on these type of designs.

...see why people would get these RF lenses if they already have the existing EF lens.

For me, there is no reason to.  I was happy with my lenses before I got the R, and I still am.

I think, however, there's some feature (high speed display?) that only works for RF lenses, though, so it might have the advantage of that.

I got the RF 35 to replace my EF 35 F2, the old version without IS.  That was well worth it, less for IS than for the macro function.  I like my old EF 24-70 F4 for the same reason.  You really only need 1-1 for bugs.

I got the RF 24-105 for the extra reach.  It's not longer enough to make much difference.  I would't buy it, if I had it to do over.   It's a good lens, but there is nothing special about it.

Would be expensive just for that option, though.

I'm a really casual sports and wildlife shooter.  I got the 100-400 to get me outside more often.  It works fine.  I'd have to be really serious to replace it with an RF version.