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| p.2 #9 · Rokinon 16mm f/2 lens available for pre-order |
The problem, as I understand it, is that APS-C DSLRs have inherited the same register distance as their FF big brothers, instead of a register distance optimized for the sensor size. As as result the complexity of making a 16mm f2 APS-C DSLR lens will be closer to complexity of a FF 16mm f2 lens, rather than a FF 24mm f2 lens. So we are not likely to get a lens like that.
It would be actually pretty impractical to reduce the register much for a native APS-C DSLR mount. 4/3rds mount, which did not inherit any legacy mount issues, has a register of approximately 38mm, a bare 2mm shorter than Konica AR mount, the shortest register of reasonably common FF mounts. It's unlikely that a decent APS-C native mount would be much shorter than the 44-46.5mm of the current 35mm AF mounts.