EF lens compatibility with EOS R series cameras

[WJ_Big]

I have an EOS 60D, and am considering upgrading to an R Series - (R6 or R8?). I do have several ES and EFS lenses, though, that I am reluctant to part with. My question is, would I lose any efficiency/photo-integrity by using these lenses with the EFS-R adaptor over starting anew with R lenses? For reference, I have EFS 11-22; EFS 18-55; EFS 55-250; Tamron 18-400 and Tamron 150-600.

[p4pictures]

Indeed you can use older DSLR lenses with an EOS R-series body using the Canon EF to EOS R mount adapter. 

Canon EF-S lenses are only designed to cover the sensor of an APS-C size image sensor 22mm x 15mm, so when you use such lenses on the Canon adapter then the full-frame EOS R-series camera automatically selects 1.6x crop mode so it only records images with the central 22mm x 15mm section of the sensor. This results in images with less resolution. On an EOS R6 Mark II or EOS R8 the full frame resolution is 24MP 6000 x 4000 pixels, but in crop mode this drops to 9.3MP 3744 x 2496 pixels. 

Not all lenses from independents like Sigma / Tamron tell the camera they are designed for a crop sensor camera. So with these you might see significant vignetting. 

There's some examples on my blog from when I found this on the EOS R full-frame model

https://www.p4pictures.com/2019/06/eos-r-crop-lenses-aps-c/ 

[WJ_Big]

Thank-you for your response. Would I be better to consider the R7, which is not full-frame?

[kvbarkley]

That is up to you, but I don't think being able to use EF-S lenses should be a deciding factor in getting full frame vs APS-C.

[p4pictures]

One alternative solution is to get the full-frame camera with a good standard lens, the RF 24-105mm f/4-7.1 IS STM or if the budget allows the RF 24-105mm F4L IS USM, plus the adapter. Then you can slowly work out which lenses you need to change over time, rather than switch everything at once.

One thing to be cauttions of with the EOS R7 is that it's sensor has rather small pixels and this can lead to more noisy photos in low light, but also show the limitations of older lenses designed for DSLRs.

RF 24-105mm F4 L IS USM

[WJ_Big]

Thank-you very much for your input. I discovered early on that a person can very easily end up spending much more on glass over time, than on the camera itself. (Especially if, like me, they tend buy things in a hodge-podge manner instead of a more planned approach!) You have given me much to think about. Much appreciated!

[kvbarkley]

But, other than auto-magically reducing the size of the image for EF-S lenses, the quality of the image is not affected with the adapter, there is no glass, it is simply a spacer.

[ebiggs1]

"I don't think being able to use EF-S lenses should be a deciding factor in getting full frame vs APS-C."

Absolutely, totally agree. IMHO, the only lens you have in the list you shared that really matters is the Tamron super zoom and then only if it is the new G2 model. If it is not a G2 you really need to start thinking RF lenses when you go R series and not what older EF or EF-S lenses you can drag along.

Yes, I agree, I know it's nice to be able to use all the old stuff but it really is old stuff (excepting the G2). If you can sell the old gear to help with the new.

[Waddizzle]

“ I have EFS 11-22; EFS 18-55; EFS 55-250; Tamron 18-400 and Tamron 150-600. “

The R8 and  R6 models are full frame sensor cameras.  All the lenses you have listed were designed for APS-C sensor cameras, except for the Tamron 150-600mm.

The APS-C lenses will not fully cover a full frame sensor.  The R7 has a APS-C sensor. While the Tamron 150-600mm is a full frame lens, is it a G2 version?  If not, do not expect it to perform as well on RF mount cameras as their Canon RF counterparts. 

[ebiggs1]

" While the Tamron 150-600mm is a full frame lens, is it a G2 version? "

Absolutely if not a G2 the OP doesn't have lenses worthy of determining which R series camera to get.