The BALPRO 1 is a manual bellows unit for macro photography which can be used with medium format, DSLR or 35mm cameras and lenses in differing combinations. Thanks to a complete system of adapters, there are over 1000 possible combinations of camera body and lens which can be attached to the BALPRO 1. For example, a Mamiya 645 lens can be used with a Canon EOS body, or a Hasselblad 2000 lens with a Pentax 645 body. To adapt DSLR cameras and lenses to the bellows you will need an APRO ring plus a Novoflex A suffix body adapter; and for the lens the PROLEI ring plus a lens mount adapter. Medium format lenses require just a single type-specific ring. The bellows can also be used with the EOS-RETRO reverse adapter to retain all metering functions with a Canon EOS lens and camera. As well as the EOS-RETRO you will need a EOS/PRO adaptor (camera end), and PRO/EOS adaptor (lens end).