topic Re: 2x extender, EOS RP, 70-200 2.8 EF in Camera Accessories

Would a 2x extender work with EOS RP and 70-200 2.8 EF?

DaleO — Tue, 25 Mar 2025 12:58:18 GMT

Will it work? I have an EOS RP, Canon 70-200 2.8 EF lens, which I use a converter to attach to the camera, would a 2x extender work?

I recall reading that the 2x extender didn't work with the EOS RP because the lens needed to extend into the camera's body, and there wasn't enough room with an adaptor, extender, and lens.

Re: 2x extender, EOS RP, 70-200 2.8 EF

March411 — Mon, 24 Mar 2025 13:23:09 GMT

From the Canon Website

Lens	1.4x	2x

RF 400mm F2.8L IS USM	560mm	800mm
RF 600mm F4L IS USM	840mm	1200mm
RF 600mm F11 IS STM	840mm	1200mm
RF 800mm F5.6L IS USM	1120mm	1600mm
RF 800mm F11 IS STM	1120mm	1600mm
RF 1200mm F8L IS USM	1680mm	2400mm
RF 70-200mm F2.8L IS USM Z	98mm-280mm	140mm-400mm
RF 100-300mm F2.8L IS USM	140mm-420mm	200mm - 600mm
RF 100-400mm f5.6-8 IS USM	140mm - 560mm	200mm - 800mm
RF 100-500mm F4.5 - 7.1L IS USM	420mm - 700mm	600mm- 1000mm
(Compatible with 300mm setting or longer only)
RF 200-800mm F6.3-9 IS USM	280 - 1120mm	400 - 1600mm

Re: 2x extender, EOS RP, 70-200 2.8 EF

jrhoffman75 — Mon, 24 Mar 2025 13:31:40 GMT

@DaleO wrote:

Will it work? I have an EOS RP, Canon 70-200 2.8 EF lens, which I use a converter to attach to the camera, would a 2x extender work?

I recall reading that the 2x extender didn't work with the EOS RP because the lens needed to extend into the camera's body, and there wasn't enough room with an adaptor, extender, and lens.

EF lens mounts on the Canon EF-R lens adapter. Nothing extends into the R camera body. The Canon extender will mount on the lens and then mount on the adapter. The Canon extender has a “nose” that extends into the lens body. That is why the Canon extenders can only be used with canon L lenses. Image quality could take a hit; you can judge that.

Re: 2x extender, EOS RP, 70-200 2.8 EF

DaleO — Mon, 24 Mar 2025 13:41:49 GMT

That's what I read online. Since I'm shooting outside baseball, I'm unsure if that's a big issue, but I'm spoiled with the 2.8 lens.

Re: 2x extender, EOS RP, 70-200 2.8 EF

DaleO — Mon, 24 Mar 2025 13:44:46 GMT

Yes, I'm seeing 2.8L now. I was hoping for solution, but I have not seen one.

Re: 2x extender, EOS RP, 70-200 2.8 EF

DaleO — Mon, 24 Mar 2025 13:49:26 GMT

Would this be an option. https://www.usa.canon.com/shop/p/extender-ef-2x-iii?color=White&type=New&srsltid=AfmBOorDeX-_3rSsNp7erdmDYQTHFiOGB8aZFs5ne6ezCwkgDYUU7zyz#reviews

Re: 2x extender, EOS RP, 70-200 2.8 EF

DaleO — Mon, 24 Mar 2025 13:51:19 GMT

Nope, just read the spec as the name is misleading.

This lens is only compatible with fixed focal length L-series lenses 135mm and over, as well as the EF 70-200/2.8L, EF 70-200/2.8L IS, EF 70-200/4L, and EF 100-400/4.5-5.6L. Additionally, please see the lens and/or camera body manual for full compatibility information with the Extender EF 2X III.

Re: 2x extender, EOS RP, 70-200 2.8 EF

jrhoffman75 — Mon, 24 Mar 2025 14:16:52 GMT

@DaleO wrote:

That's what I read online. Since I'm shooting outside baseball, I'm unsure if that's a big issue, but I'm spoiled with the 2.8 lens.

I have both the EF70-200 f/2.8L II and the EF100-400 f/4.5-5.6L II. Also have the EF 1.4X III and EF 2.0 III. I get better results with the 1.4X and cropping.

Re: 2x extender, EOS RP, 70-200 2.8 EF

March411 — Mon, 24 Mar 2025 16:33:13 GMT

Sorry, loaded the wrong table, here is the EF compatibility

EF extender compatibility guide
Lens	Lens with 1.4×	AF with 1.4×	IS with 1.4×	Lens with 2×	AF with 2×	IS with 2×
135 mm f/2L USM	190 mm f/2.8	Yes	—	270 mm f/4	Yes	—
180 mm f/3.5L Macro USM	252 mm f/5	Yes	—	360 mm f/7.1	No	—
200 mm f/1.8L USM	280 mm f/2.5	Yes	—	400 mm f/3.5	Yes	—
200 mm f/2.0L IS USM	280 mm f/2.8	Yes	Yes	400 mm f/4	Yes	Yes
200 mm f/2.8L II USM	280 mm f/4	Yes	—	400 mm f/5.6	Yes	—
300 mm f/2.8L USM	420 mm f/4	Yes	—	600 mm f/5.6	Yes	—
300 mm f/2.8L IS USM	420 mm f/4	Yes	Yes	600 mm f/5.6	Yes	Yes
300 mm f/2.8L II IS USM	420 mm f/4	Yes	Yes	600 mm f/5.6	Yes	Yes
300 mm f/4L USM	420 mm f/5.6	Yes	—	600 mm f/8	f/8 only	—
300 mm f/4L IS USM	420 mm f/5.6	Yes	Yes	600 mm f/8	f/8 only	f/8 only
400 mm f/2.8L USM	560 mm f/4	Yes	—	800 mm f/5.6	Yes	—
400 mm f/2.8L II USM	560 mm f/4	Yes	—	800 mm f/5.6	Yes	—
400 mm f/2.8L IS USM	560 mm f/4	Yes	Yes	800 mm f/5.6	Yes	Yes
400 mm f/4 IS DO USM	560 mm f/5.6	Yes	Yes	800 mm f/8	f/8 only	f/8 only
400 mm f/5.6L USM	560 mm f/8	f/8 only	—	800 mm f/11	No	—
500 mm f/4L IS USM	700 mm f/5.6	Yes	Yes	1000 mm f/8	f/8 only	f/8 only
500 mm f/4.5L USM	700 mm f/6.3	f/8 only	—	1000 mm f/9.0	No	—
600 mm f/4L USM	840 mm f/5.6	Yes	—	1200 mm f/8	f/8 only	—
600 mm f/4L IS USM	840 mm f/5.6	Yes	Yes	1200 mm f/8	f/8 only	f/8 only
800 mm f/5.6L IS USM	1120 mm f/8	f/8 only	f/8 only	1600 mm f/11	No	f/8 only
1200 mm f/5.6L USM	1680 mm f/8	f/8 only	—	2400 mm f/11	No	—
70–200 mm f/2.8L IS USM	98–280 mm f/4	Yes	Yes	140–400 mm f/5.6	Yes	Yes
70–200 mm f/2.8L IS II USM	98–280 mm f/4	Yes	Yes	140–400 mm f/5.6	Yes	Yes
70–200 mm f/2.8L USM	98–280 mm f/4	Yes	—	140–400 mm f/5.6	Yes	—
70–200 mm f/4L IS USM	98–280 mm f/5.6	Yes	Yes	140–400 mm f/8	f/8 only	f/8 only
70–200 mm f/4L USM	98–280 mm f/5.6	Yes	—	140–400 mm f/8	f/8 only	—
100–400 mm f/4.5–5.6L IS USM	140–560 mm f/6.3–8	f/8 only	f/8 only	200–800 mm f/9–11	No	f/8 only
100–400 mm f/4.5–5.6L IS II USM	140–560 mm f/6.3–8	f/8 only	f/8 only	200–800 mm f/9–11	No	f/8 only
200–400 mm f/4L IS USM	280–560 mm f/5.6	Yes	[unsure]	400–800 mm f/8	f/8 only	[unsure]
(without built-in extender 1.4×)
200–400 mm f/4L IS USM	400–800 mm f/8	f/8 only	[unsure]	560–1120 mm f/11	No	[unsure]
(with built-in extender 1.4×)
TS-E 17 mm f/4L	24 mm f/5.6	No	—	34 mm f/8	No	—
TS-E 24 mm f/3.5L	35 mm f/5.0	No	—	50 mm f/7.1	No	—
TS-E 24 mm f/3.5L II	35 mm f/5.0	No	—	50 mm f/7.1	No	—
TS-E 45 mm f/2.8	65 mm f/4.0	No	—	90 mm f/5.6	No	—
TS-E 90 mm f/2.8	125 mm f/4.0	No	—	180 mm f/5.6	No	—

https://eflens.com/lens_articles/ef_extender.html