Yep. The two RF UWA lenses have caught my attention. The IQ certainly seems to be there, but I am more interested in the combination of in lens and in body stabilization. Even if do not get the advertised 8 stops, being able to hand hold 1-2 second shots would mean that I can leave a tripod home more often.

As an example, this is a <10% of the frame crop from an image I took out in Banff (Vermillion lakes). Hand held, 0.5 sec with the 24-70 II (ISO 2000, hence some noise when you crop that much), but I am routinely seeing 4 stops from IBIS alone with this lens that does not have in lens IS and does not have the additional communication RF mount allows.

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IBIS is legit.