Pocketwizard MultiMAX Transceiver  type_Darkroom Accessories 5 lens for the Mamiya

5 lens for the Mamiya C series of interchangeable lens TLR cameras

you can do it

The Nikon TC-20E is an autofocus teleconverter designed for select Nikon AF-I and AF-S telephoto lenses (here's Nikon's product page with details)

here's one

Pocketwizard MultiMAX Transceiver &nbsptype_Darkroom Accessories 5 lens for the MamiyaThe Pocketwizard MultiMAX Transceiver is a sophisticated triggering solution for Pocketwizard systems, with multiple delay and triggering modes for flash and camera control. Includes manual and quick reference card; does not include connecting cords. Note that this item is a single transceiver; you will need at least one more Pocketwizard device to trigger a camera or flash as described above.