RF-S10-18mm F4.5-6.3 IS STM compatibility with EOS R

[gears4steam]

Is the new (RF-S10-18mm F4.5-6.3 IS STM) lens compatible with an EOS R body?  Canon advertises the 10-18mm for the APS-C camera, but gives no additional insight if that discounts the use of a non-APS-C camera.  

Or as usual, am I reading too much into this?

Denver

[rs-eos]

Yes, you can use any RF or RF-S lens on any R-Series camera.

However, when using an RF-S lens on a full frame R-Series camera, you'll need to use the 1.6x crop mode.  That will lead to images using 2.56 times less resolution then when using the full sensor.  2.56 x is found by squaring 1.6 (you have to apply the crop factor to both width and height dimensions; hence using its square).

The User Manual states on page 80 that when using EF-S lenses, the 1.6x crop will automatically be selected.  Not sure if it will also automatically do that for RF-S lenses.

[deebatman316]

RF-S lenses causes the camera to auto crop. Just like a Canon EF-S lens. Some third Party lenses may need to be set to 1.6x crop mode. 

[gears4steam]

Thank you Very much for your insight, it is appreciated! Both responses in the forum gave me the answer. 

Denver

[shadowsports]

I am not a proponent of APS-C lenses on a FF body.  This lens will effectively turn the EOS R's 30.3MP images into 11.6MP images.

If you plan to put them on a smart phone or small prints, its probably fine. 

I would do some research as this is not something I would recommend due to this limitation   The RF 10-20 would be a better choice and will be available soon.

[ebiggs1]

Plus your 10mm will no longer be 10mm. Full-frame models provide for a 1.6x crop corresponding to a section of the sensor similar in size to an APS-C size sensor. "The RF 10-20 would be a better choice and will be available soon." Bingo! 🤔