The previously rumored NiSi 15mm f/4 wide-angle manual focus full-frame mirrorless lens is now officially announced and available for pre-order (NiSi products are also sold at Amazon, and B&H):
NiSi 15mm f/4 lens specifications:
Lens design:
MTF charts:
Additional pictures:
NiSi 15mm f/4 lens by NikonRumors
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