Recent content by pwp productions

Just about to drop the Mastercard on a MetaBones Speedbooster for Canon EF to GH4. It's not 100% clear which one is the best match. There's the Canon EF to MFT SpeedBooster (MB_SPEF_M43-BM1) and the Canon to EF MFT Speedbooster S (MB_SPEF_M43-BM2) What is the difference? Thanks. -pwp