Canon lens adapters: I am considering purchasing a Canon R5 to replace my 7D 2. If I purchase the adapter to use my Canon 100 to 400 L lens I know it will work fine with the mirrorless...

Ed Atts

I am considering purchasing a Canon R5 to replace my 7D 2. If I purchase the adapter to use my Canon 100 to 400 L lens I know it will work fine with the mirrorless body. I also use the Canon 1.4 tele extender with this lens on the 7D2 body and want to know if it will also work the same on the R5 body.

clansman Loc: wendover,england

Yes it will. I have the R5 , the adaptor, the 1.4 extender and the EF 100-400mm, all Canon. Put all together the result is fine, no vignetting or anything else.

LFingar Loc: Claverack, NY

Ed Atts wrote:

I am considering purchasing a Canon R5 to replace my 7D 2. If I purchase the adapter to use my Canon 100 to 400 L lens I know it will work fine with the mirrorless body. I also use the Canon 1.4 tele extender with this lens on the 7D2 body and want to know if it will also work the same on the R5 body.

Everything will work fine. I have used the 100-400 L II along with both the 1.4 and 2.0 extenders with the Canon adaptor on both my previous R and current R5. Works even better then on my previous 5D.

47greyfox Loc: on the edge of the Colorado front range

When I bought a R5 and sold a 5d4, I did nothing with my EF lenses because with the $100 EF to RF adapter allowed use of my 50mm, 16-35 f4L, 24-70 f2.8L, 70-200 f4L, 100-400 ii, 150-600 cont, and 1.4x teleconverters. And last but not least, 100 macro. All work like a charm. The EF to RF adapter never leaves the camera, which means my lone RF 24-105 f4L doesn’t get much use.

robertjerl Loc: Corona, California

If you should add an RF-s crop body and then buy an RF-s lens they will all mount and work on both bodies as in the EOS R world both FF and Crop sensors have the same mount unlike EF where there are two different mounts.

PHRubin Loc: Nashville TN USA

The R5 is a full frame camera, the 7DII is a crop body camera. You will lose the 1.6 effective multiplier on your lenses. If you choose to crop images by a factor of 1.6 in post processing to get it back, you will be left with a 17.6 MP photo.

I chose the R7, also a crop body camera to keep the 1.6 crop factor. At 32MP it is much better than cropping the image of a 45 MP full frame.

PHRubin Loc: Nashville TN USA

robertjerl wrote:

... unlike EF where there are two different mounts.

Misleading!

My understanding is that while an EF lens will protrude into a full frame and not mount properly, that is only for Canon brand lenses. Most "crop lenses" by other manufacturers will mount on full frame DSLRs but may/will cause vignetting. In fact, the mount is the same for full frame and crop DSLR cameras which is why EF lenses as well as EF-S lenses fit Canon crop body DSLRs.

robertjerl Loc: Corona, California

PHRubin wrote:

The R5 is a full frame camera, the 7DII is a crop body camera. You will lose the 1.6 effective multiplier on your lenses. If you choose to crop images by a factor of 1.6 in post processing to get it back, you will be left with a 17.6 MP photo.

I chose the R7, also a crop body camera to keep the 1.6 crop factor. At 32MP it is much better than cropping the image of a 45 MP full frame.

I don't do a lot of full frame photography (I do a lot of birdies, I use crop sensors and long lenses) so I got the RP, which is light, small and takes excellent pictures. For my RF crop sensor, I also have the R7 and love it, in fact I love both of them. My full frames are for landscape, trains and indoor or low light work and macro, though the crop sensor bodies work well for macro also.
I have two of the EF to RF adapters because I have a ton of EF and EF-s lenses and 8 RF lenses. Too bad there isn't an RF to EF adapter

And yes, the adapters work with a 1.4x or 2x extender on the EF lenses.

robertjerl Loc: Corona, California

PHRubin wrote:

Misleading!

My understanding is that while an EF lens will protrude into a full frame and not mount properly, that is only for Canon brand lenses. Most "crop lenses" by other manufacturers will mount on full frame DSLRs but may/will cause vignetting. In fact, the mount is the same for full frame and crop DSLR cameras which is why EF lenses as well as EF-S lenses fit Canon crop body DSLRs.

RF and RF-s bodies have the exact same mount, and all RF lenses will mount on both type bodies. EF and EF-s bodies have different mounts, an EF lens will fit and work on an EF-s body but an EF-s lens will NOT mount on an EF body. There is an extra little tab on Canon EF-s lenses that prevents them mounting on an EF body at all. Try to force it, and you will have a big $$$ repair bill.

And yes, most third party lenses for Canon use the EF mount even if it is a crop sensor lens.

I have 4 EF-s bodies (one is my wife's) and 2 EF. 1 RF body and 1 RF-s body. and two dozen lenses between the two types.

CHG_CANON Loc: the Windy City

PHRubin wrote:

Misleading!

My understanding is that while an EF lens will protrude into a full frame and not mount properly, that is only for Canon brand lenses. Most "crop lenses" by other manufacturers will mount on full frame DSLRs but may/will cause vignetting. In fact, the mount is the same for full frame and crop DSLR cameras which is why EF lenses as well as EF-S lenses fit Canon crop body DSLRs.

You're mixing up multiple technical issues.

The EF extenders (1.4x and 2.0x, all versions) do literally 'extend' into the compatible EF L-series lenses. This design makes these Canon-branded equipment physically incompatible with many Canon EF / EF-S and third-party EF-mount lenses.

But, in relation to the EF and RF mounts, the EF to RF mount adapter supports both EF and EF-S lenses, even though the EF-S lenses cannot be mounted to full-frame EF-mount bodies.

Returning to extenders / tele-converters, how third-party equipment connects to Canon lenses, it still might be a case-by-case basis.

Finally, only Canon creates 'true' EF-S lenses for their cropped sensor bodies. Third-parties creating lenses for Canon's 1.6x crop factor sensors, all these third-parties accomplish this using Canon's EF-mount that exists on the same target EOS cropped-sensor bodies.

Leaning Ladder Loc: Bethlehem, Pennsylvania

I did the same upgrade a while back, except with the R6 instead of R5. Haven't had any problems with the adapter and any of my EF lenses. I sometimes miss the crop factor of the 7DII but it's a tradeoff for the full frame R6.

User ID

PHRubin wrote:

The R5 is a full frame camera, the 7DII is a crop body camera. You will lose the 1.6 effective multiplier on your lenses. If you choose to crop images by a factor of 1.6 in post processing to get it back, you will be left with a 17.6 MP photo.

I chose the R7, also a crop body camera to keep the 1.6 crop factor. At 32MP it is much better than cropping the image of a 45 MP full frame.

Youre getting 32MP instead of 28MP, nothing significant there, and yet youre stuck at APSC, no option to "uncrop" back to 45MP and FF. Id rather maintain the option, but then thaz me.

buckscop Loc: Bucks County PA

What are the UHH opinions on this. I bought an R7 with the kit lens of 18-150. Leaving price out of it, In UHH opinion, would buying a 2x extender for it, be better quality than buying an adapter for the EF-S Tamron 18-400 I used on the Canon T7i.

CHG_CANON Loc: the Windy City

buckscop wrote:

What are the UHH opinions on this. I bought an R7 with the kit lens of 18-150. Leaving price out of it, In UHH opinion, would buying a 2x extender for it, be better quality than buying an adapter for the EF-S Tamron 18-400 I used on the Canon T7i.

You'll find the Canon RF 2x extender has the same technical limitations as the EF version. The RF extender is not physically compatible with the RF-s 18-150. Nor would it be compatible with the Tamron 18-400. If you want a longer lens, buy a longer lens.

User ID

buckscop wrote:

What are the UHH opinions on this. I bought an R7 with the kit lens of 18-150. Leaving price out of it, In UHH opinion, would buying a 2x extender for it, be better quality than buying an adapter for the EF-S Tamron 18-400 I used on the Canon T7i.

Id go for the adapter. Not only would I rather have use of that 400 zoom than any TC, but the adapter can add a verrrry handy control ring (cost a bit extra but I am super glad that I got the ring). Beyond that, the adapter also means that youll likely encounter some great deals on an EF/EFs lenses. GAS is good.

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My own R (mk zero) accesses my hoard of EF lenses. The one RF lens that ever followed me home is the tiny 16/2.8, cuz Bestbuy was just about giving it away. Im not in the market for more RF lenses, but recently got another EF !