topic Re: Compatibility in EOS DSLR & Mirrorless Cameras

EOS R EF Lens Compatibility

Nitro54 — Tue, 07 Mar 2023 14:30:41 GMT

I have a question I hope someone can answer for me.

I have the Canon R camera. I found a good deal on a used EF 600 older lens.

Can I put on my R to EF lenses converter, put on a 2x teleconverter, then the lens

and still have it work on my camera?

Thank you, Glen

Re: Compatibility

kvbarkley — Sun, 05 Mar 2023 01:50:55 GMT

I doubt the teleconverter will yield good image quality, but it should work. Ken Rockwell showed something like this.

Re: Compatibility

kvbarkley — Sun, 05 Mar 2023 03:38:05 GMT

Found it!

https://www.kenrockwell.com/canon/eos-r/r.htm

Scroll down the page to see him use the EF 100-400, a 1.4 TC and a 2.0 TC!

Re: Compatibility

Nitro54 — Sun, 05 Mar 2023 04:17:58 GMT

I have the RF 2x and a RF 100-400 lens. Just looking for more reach with a full frame camera.

Re: Compatibility

Mitch_P — Sun, 05 Mar 2023 07:59:42 GMT

It will work, but the picture quality won't be as good as with the RF Extender. There's a hack out there to modify a cheap EF to RF adapter and use the RF Extender on an EF lens. I tried it and it works, but it's definitely not ideal.

Re: Compatibility

Waddizzle — Sun, 05 Mar 2023 08:15:00 GMT

@Mitch_P wrote:
It will work, but the picture quality won't be as good as with the RF Extender. There's a hack out there to modify a cheap EF to RF adapter and use the RF Extender on an EF lens. I tried it and it works, but it's definitely not ideal.

I’m not so sure about that. He wants to use the RF Extender with the RF-EF mount adapter. I do not believe that would work. The RF Extender is made exclusively for RF lenses, not adapted EF lenses. The OP needs an EF Teleconverter for EF mount lenses.

It might though. One can never say never. I would be truly surprised if it did.

Re: Compatibility

Mitch_P — Sun, 05 Mar 2023 08:43:45 GMT

I read it as camera -> to EF-RF converter -> to EF Extender -> then EF Lens. That definitely works, I've done it many times. The RF Extender -> to EF lens is do-able with a hack. It will also work with lenses that are not normally compatible with a extender. The EXIF gets a little messed up, but lists the RF Extender so it's not unworkable. Not ideal, but it's just a hack. And the RF extender is a lot sharper than the EF II, at least to my eye. I haven't tried the EF Extender III.

Re: Compatibility

ata — Sun, 05 Mar 2023 09:44:24 GMT

Of course it works, I have Canon Ef 300mm f/2.8L IS USM II + 2x Extender III +1.4x Extender III with RF-EF mount adapter but I recommend you buy a 1.4x III converter instead of 2x III. You can get cleaner photos than 2x III.

Re: Compatibility

shadowsports — Sun, 05 Mar 2023 14:28:36 GMT

@kvbarkley..

Wow

@Nitro54. I don't think I've seen a post like this here before. I'm skeptical, but hopeful for you. Let us know if it works for you.

Re: Compatibility

Nitro54 — Sun, 05 Mar 2023 19:51:24 GMT

I just tried a RF 2x extender and, RF-EF adapter and a EF 75-300 lens

and the Rx Extender won't attach with the adapter. Looks like I would also need a

2x Extender III or 1.4x Extender III to make this work. Thanks for all the advice.

Re: Compatibility

Mitch_P — Sun, 05 Mar 2023 20:00:52 GMT

Your description is confusing. An RF Extender will not work with an EF camera or lens, or stock EF-RF adapter.

Re: Compatibility

Nitro54 — Sun, 05 Mar 2023 21:03:55 GMT

I have the RF to EF adapter

Re: Compatibility

Nitro54 — Sun, 05 Mar 2023 21:08:53 GMT

Thanks for all the help everyone, I've decided to stay with the RF lenes for now.

For now to get the extended range I'm looking for I'll get the 800 F11 and the RF 1.4 extender.

Re: Compatibility

Mitch_P — Sun, 05 Mar 2023 21:08:59 GMT

Your original post made it sound like you were trying to connect an EF extender/lens to your adapter. That would work fine, so you're right. You need an EF Extender.

Re: Compatibility

shadowsports — Mon, 06 Mar 2023 00:18:06 GMT

I think this is a good choice. Using native glass will likely yield the best results.

Re: Compatibility

Waddizzle — Mon, 06 Mar 2023 00:31:09 GMT

@Mitch_P wrote:
Your description is confusing. An RF Extender will not work with an EF camera or lens, or stock EF-RF adapter.

That’s what I tried to point out to you earlier. But, you said it works for you with a hack.

Re: Compatibility

Mitch_P — Mon, 06 Mar 2023 01:20:26 GMT

I actually said it can be done with a hack. Do a search on Google or YouTube and a number of hits will come up. You basically buy a cheap EF/RF adapter and enlarge the opening until the RF Extender fits. That's pretty much it. I tried it and it works, I was able to use the RF 1.4X extender with an EF 400mm f5.6. But I don't use it regularly, I have an RF 100-500mm that works fine with my RF 1.4X extender. The OPs original question isn't very well worded, it can be taken in different ways.