which in turn affects the size of the rest of the lens elements. Sort of. The diameter of the front element is predetermined, a function of the sensor size, fo

which in turn affects the size of the rest of the lens elements. Sort of. The diameter of the front element is predetermined, a function of the sensor size, focal length, and aperture. Mirrorless cannot escape this. But, the shorter distance from sensor to lens does simplify the design of a good wide angle. Sadly, wide angles were never the big heavy lenses in the first place. The whole smaller & lighter thing is not a lie but pretty oversold. Some of the RF glass is actually bigger and heavier than the equivalent EF glass.