topic Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III? in EF & RF Lenses

Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

StraightShooter — Sat, 15 Oct 2022 22:42:36 GMT

I just bought the Canon EOS 1DX Mark III, and have an EF camera (1 red circle on lens mount). According to Canon's site, I should use EF-EOS R or M. https://www.canon-europe.com/lenses/tech-guide/compatibility/

I don't know which mount adapter to use, unless I'm misunderstanding and I can use either.

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

Waddizzle — Fri, 28 Oct 2022 20:58:45 GMT

Neither mount adapter would work. You can use DSLR lenses [on] MILC bodies, but not the other way around. MILC lenses cannot be adapted to use on DSLR bodies.

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

Tronhard — Fri, 28 Oct 2022 16:32:55 GMT

Do you mean you just bought the 1DX MkIII and have and EF lens (not camera)? That lens should fit directly onto the 1DX body without and adapter.

As Waddizzle said (but you may not have understood his terminology) you cannot fit that EF lens on either an EOS M or EOS R body - there is no adapter because of the physical characteristics of those mounts.

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

Lotus7 — Fri, 28 Oct 2022 20:22:48 GMT

"As Waddizzle said (but you may not have understood his terminology) you cannot fit that EF lens on either an EOS M or EOS R body -- there is no adapter because of the physical characteristics of those mounts."

Whoops! TREVOR, I'm sure you really didn't mean to say that.

Actually, as Waddizzle said: A EF lens will directly fit a 1DX MkIII without any adapter, but for use on a mirrorless RF mount [body] would need a EOS-EF R adapter or a EF-EOS M adapter to work on a M camera.

EF and EF S lenses have a back focus distance of 44 mm, so there is plenty of room for adapters to fit the 20 mm RF flange to image sensor space. However the reverse is not true. Without including relay optics, it's not possible to place a RF or M mount lens on a EF body and have it work optically.

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

Tronhard — Fri, 28 Oct 2022 20:13:42 GMT

Oops! You are RIGHT. Thanks for catching that.

I meant to say you cannot fit the EF-s, EF-M, RF or RF-S lenses on the DSLR body you have, which I am guessing is what you want to do since you say you have the 1DX body which is a full-frame DSLR camera..

The only lenses that will fit your camera are EF type lenses.

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

StraightShooter — Fri, 28 Oct 2022 20:47:31 GMT

Ok, so EF lenses. Yes, I have a full-frame hybrid DSLR/ mirrorless. From my understanding of their page, I can use EF, TS-E, or MP-E lenses. Scrolling down the page though (on the link I included in my original question), I came across Canon adapters, and that's what confused me and prompted me to ask here.

Thank you, everyone.

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

Tronhard — Fri, 28 Oct 2022 21:11:35 GMT

Since I understand it that the OP has the 1DX body, I am assuming they want to know what lenses will work with that. To try to sort that out, I enclose the following table: Now Corrected!

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

Tronhard — Fri, 28 Oct 2022 20:58:15 GMT

To avoid any confusion when engaging with folks - who might be wondering what a hybrid is, the 1Dx is still considered a DSLR - despite the fact that many later such DSLR camera can use the LCD at the back and read straight off the sensor.

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

Waddizzle — Fri, 28 Oct 2022 21:03:52 GMT

@Tronhard wrote:
Since I understand it that the OP has the 1DX body, I am assuming they want to know what lenses will work with that. To try to sort that out, I enclose the following table:

Wait a second. Does that chart actually say that EF-M lenses can be used on APS-C DSLR camera bodies with an adapter? If so, then that would be incorrect.

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

Tronhard — Fri, 28 Oct 2022 21:09:39 GMT

Thank you for the correction Bill, I shall replace that post IMMEDIATELY - I had a prickly feeling at the back of my neck, but could not pin it down. That's where a second person looking at it is invaluable!

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

deebatman316 — Fri, 28 Oct 2022 21:09:46 GMT

Hi Trevor there is a mistake in the chart pertaining to EF-M lenses being compatible with an adapter on an APS-C DSLR.

-Demetrius

40D, 5D IV, EF 16-35mm F/2.8L III, EF 24-70mm F/2.8L II, EF 28-135mm F/3.5-5.6 IS USM, EF 50 F/1.8 STM

430EX III-RT & 600EX II-RT

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

Tronhard — Fri, 28 Oct 2022 21:12:44 GMT

Thank you Demetrius, already corrected, but thanks for finding it and letting me know! Hopefully all sorted now.

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

Lotus7 — Fri, 28 Oct 2022 21:24:28 GMT

Good catch! Wonder who prepared that chart? That A should be a N.

Physically it's not possible optically without the use of relatively expensive relay or GRIN optics whose expense would make such an adapter financially not viable. EOS M lenses have a very short 18 mm flange/sensor distance which just doesn't work with the 44 mm APS-C DSLRs flange distance.

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

Tronhard — Fri, 28 Oct 2022 21:30:43 GMT

Better late than never! I made the chart on the fly, so the error was mine, but I fixed the error (thanks to all again for spotting that), and hopefully there are no further corrections!

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

deebatman316 — Fri, 28 Oct 2022 21:32:59 GMT

Hey we all make mistakes especially if we're trying to make compatibility charts on the fly.

-Demetrius

40D, 5D IV, EF 16-35mm F/2.8L III, EF 24-70mm F/2.8L II, EF 28-135mm F/3.5-5.6 IS USM, EF 50 F/1.8 STM

430EX III-RT & 600EX II-RT

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

Tronhard — Fri, 28 Oct 2022 21:35:02 GMT

I've been having a few challenges lately. I am being treated for cancer and it seems to have spawned a stroke as well. I try my best to check, but sometimes I miss things. I do welcome any corrections that folks find - I'm not too proud to be corrected!

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

ebiggs1 — Mon, 31 Oct 2022 15:05:42 GMT

Trevor I haven't had a stroke ...yet, BTW I certainly hope you make a full recovery, and had trouble following the OP's post.

"I just bought the Canon EOS 1DX Mark III, and have an EF camera ..."

My understanding is he owns a 1DX Mk III. My question is, you bought a $6500 dollar camera and don't know what lenses it uses?

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

Lotus7 — Mon, 31 Oct 2022 15:59:57 GMT

EB: "My question is, you bought a $6500 dollar camera and don't know what lenses it uses?"

WHAT? $6500 for a camera, and you're saying he/she has to buy something called a "lens" too?😊

(sorry - couldn't resist)

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

ebiggs1 — Mon, 31 Oct 2022 16:03:07 GMT

I heard that somewhere.

Re: Which mount adapter, EF-EOS R or M, can I use for EOS 1DX Mark III?

Tronhard — Mon, 31 Oct 2022 16:17:20 GMT

Thanks for your kind words Ernie. I am determined to get past this, but I shall likely have the odd SNAFU from time to time! 🙄