Manufacturers and Importers

Canon	Nikon	Fuji	Kenro
Olympus	Sony	Leica Cameras	Tamron (USA)
Panasonic		Sigma	Tamron (UK Importer)

Hardware

SRB-Griturn

Makers of bespoke adapters such as reversing rings and coupling rings.

Retailers

Jessops
Wex Photographic	Used to be Warehouse Express.