Canon makes three 50mm lenses in the RF mount. I've owned several copies of the very cheap f/1.8 STM version as they are frequently on sale and then I trade them in with almost no loss on the transaction. It's not my favorite lens.
Here is the diagram of the f/1.8 version.
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| $200 lens |
The f/1.2L version is amazing but big, heavy and very, very expensive. I owned the EF version of this lens, which is smaller, lighter and less expensive, which I used with an adapter on my EOS R6. Here is a gallery with photos from the EF version.
Here is the diagram of the RF f/1.2L version.
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| $2,300 lens |
Last October, Canon introduced an f/1.4L version of the lens which is unlike any 50mm lens Canon's made before. It's an L lens so it's weather sealed. It has an aperture ring, although it will only function in video mode on my R6 Mark II. It also has a button on the lens which I will set for depth of field preview. Here is a diagram of the RF f/1.4L version.
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| $1,400 lens |
Here is a photo from The Digital Picture showing all three of these lenses together with the old EF 50mm f/1.4 USM lens.
I dismissed this lens when it first came out because I was using EOS R8 bodies without IBIS and the lens does not have its own image stabilization. But now that I'm using an R6 Mark II body with IBIS I will have up to 7 stops of image stabilization with the lens. With three stops of extra light (8 times as much light) and shallower depth of field options compared to my 24-105mm f/4L lens it will add a lot to my capabilities.
Here are photos of the two lenses I'll now be using, again courtesy of The Digital Picture.





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