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I'm looking to see if there is any benefit to mountiig an "Extender EF 1.4x III" to a "canon eos r lens mount" for my Sigma 14-24mm for Canon EF, with a Canon EOS R body. Any takers? 
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...
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