topic Re: Extender for EF 100-400 L lens on a R5 body in EF & RF Lenses

Extender for EF 100-400 L lens on a R5 body

jsteffenson — Thu, 24 Aug 2023 19:32:24 GMT

I have an R5 and an EF 100-400 L lens with a RF-EF converter and would like to try a 1.4x extender. I assume I should get an EF 1.4 extender to mount between the converter and the lens rather than RF extender to mount to the camera and then the converter. Can someone confirm? Thanks!

Re: Extender for EF 100-400 L lens on a R5 body

FloridaDrafter — Thu, 24 Aug 2023 20:43:04 GMT

@jsteffenson wrote:
I have an R5 and an EF 100-400 L lens with a RF-EF converter and would like to try a 1.4x extender. I assume I should get an EF 1.4 extender to mount between the converter and the lens rather than RF extender to mount to the camera and then the converter. Can someone confirm? Thanks!

Yes, you need the EF teleconverter. If you try to work it out in your head, the RF seems like it should work, but when you have the devices in hand, which I do, you will find that the RF 1.4X teleconverter will not mount to the EF>RF adapter. The RF's elements extend too far into the adapter. I'm sure "not fitting" wouldn't be the only problem, but I'm no lens engineer 🙂

Newton

Re: Extender for EF 100-400 L lens on a R5 body

jsteffenson — Thu, 24 Aug 2023 20:58:26 GMT

That's what I thought, thanks!