First pictures of the cheap Chinese Speed Booster alternative! To ship from May already! | sonyalpharumors Based on Chinese forum posts, Zhongyi/Mitakon currently have PK, FD, and MD (SR) "Lens Turbo" at Beijing P&E (photo exhibit?). AI, EF, C/Y, Leica-R, alpha, M42 coming soon. The combined crop factor is 1.089, slightly higher than "Speed Booster".