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Originally posted by squareeyes I had forgotten the 18-50. It does retract so it stores smaller: just bigger than the 21 DA. Thanks for mentioning it.
I Still think there is a big place for pentax to introduce a compact mirrorless with widely compatible lenses that enter the mirror box space.
That is not a way to design lenses for mirrorless if mirrorless is a system designed for the future users.
K-mount will just be a severe limitation on lenses designed for mirrorless, and much of the point of using K-mount is lost if lenses are designed not being compatible with K-mount.
And designing lenses that protrude into the lens mount will also put severe limitation on optical and mechanical design. So it can only be used on very slow lenses, but once the lenses get very slow they can be designed very compact without protruding into the mount.
It's not by chance all manufacturers of mirrorless have choosen a new mount for mirrorless. It is the only way that make sense on a future proof system. It's only on a new mount that lenses can be fully optimised for mirrorless.