DPReview.com is closing April 10th - Find out more

RF 400, or EF 400 with adapter?

Started Jul 11, 2021 | Discussions thread
Tambopata Regular Member • Posts: 164
Re: RF 400, or EF 400 with adapter?

PicPocket wrote:

Tambopata wrote:

tkbslc

It's the exact same lens with the same motors, how could it perform AF better?

It's all in the electronics. The RF mount has more connectors than the EF mount (12 vs 8 if I recall correctly), probably more power can be delivered to drive the AF-motors faster, more AF actuations per second to deliver faster and more precicse AF. Canon is quiet about it, but my guess is that all the wireing is changed to allow for complete access to the RF protocol.

Probably. Guess.

If we are guessing, my guess is that it is the exact same lens as EF version with the adapter bolted on. The adapter has 12 pins too. My guess is this is no different

The adaptor has 12 pins to make it compatible with the RF mont, EF mount still only has 8 pins, and that's potentially lots of info lost in translation.

My guess again is that the full answer is connected to the release of the R3. Maybe only the RF-version is able to do 30 fps.

 Tambopata's gear list:Tambopata's gear list
Canon EOS R5 Canon EF 600mm f/4.0L IS II USM Canon RF 24-105mm F4L IS USM
Post (hide subjects) Posted by
cjb
cjb
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow