Why the 12mm prime barrier?

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mount evans
mount evans Regular Member • Posts: 399
Why the 12mm prime barrier?

With the exception of the manual focus Cosina Voigtländer Nokton 10.5mm f/0.95, it seems that micro four thirds primes stop at 12mm and everything shorter than that is a fisheye.  Yet zoom lenses go down to 7mm claiming to be rectilinear (and there appears to be a demand for them), and full-frame DSLR systems have primes going down to 14mm despite having to design around a flapping mirror.

I can understand micro four thirds being considered a dead field now, but back when there were an awful lot of new primes coming out crowding pretty close to each other in focal length, why did no one seek to exploit the open territory of the short end?

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