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https://creativityinnovationsuccess.wordpress.com/2017/11/28/mirrorless-comparison-compares-olympus-m-zuiko-pro-17mm-and-45mm-f-1-2-with-olympus-m-zuiko-17mm-and-45mm-f-1-8-primes/
Mirrorless Comparison Compares Olympus M.Zuiko Pro 17mm and 45mm f/1.2 with Olympus M.Zuiko 17mm and 45mm f/1.8 Primes