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

RF 400, or EF 400 with adapter?

Started Jul 11, 2021 | Discussions thread
dgumshu
dgumshu Veteran Member • Posts: 4,623
Re: RF 400, or EF 400 with adapter?

lokatz wrote:

Still fairly new to the Canon world, so I'm hoping someone can help me with this:

I am contemplating getting a 400mm f/2.8 lens for my R5. From what I can see, it appears to make more sense to get the latest version of the EF lens and put it on the body via a control ring adapter since the RF lens has no control ring. I like the added flexibility the control ring gives me, even if its placement is quite inconvenient.

Availability put aside, is there ANY disadvantage to this that I need to be aware of and that would speak for getting the RF lens instead?

EF to RF adapters work perfectly. However, the RF has extra pins. You may want to call Canon Tech Support or CPS to ask what these extra pins are for. That should help point you in the right direction... rather than just guessing. These could be for added AF speed or other functional purpose on upcoming bodies.  I don't think anyone here really knows.  Call Canon

-- hide signature --
 dgumshu's gear list:dgumshu's gear list
Canon EOS-1D X Canon EOS 5DS R Canon EOS 5D Mark IV Canon EOS R5 OM-1 +52 more
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