Manufacturers and Importers

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

Hardware

SRB-Griturn

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

Retailers

Jessops
Warehouse Express