MOD - filter frame for Opto Sigma Plano-Convex lens on November 13, 2018 filter frame lens mod Opto Sigma plano convex +
Disassembly – Mitakon ZhongYi 50mm F0.95 mark II “Dark Knight” lens on November 10, 2018 50mm disassembly f0.95 lens mitakon Sony speedmaster ZhongYi +