NiSi 15mm f/4 wide-angle manual focus full-frame mirrorless lens is now officially announced. The US price of the lens is $579.00 and available for pre-order. You can also find NiSi products at Amazon, and B&HPhoto. NiSi 15mm f/4 full-frame lens is available for Nikon Z, Canon R, Sony E, and Fuji X mounts.
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https://www.dailycameranews.com/2021/01/nisi-15mm-f-4-manual-focus-lens-for-full-frame-mirrorless/