Canon
Kowa
Leica
Nikon
Olympus
Opticron
Panasonic
Pentax
Sigma
Sony
Stuartline Wildlife Cruises
Swarovski
Tamron
Tokina
Wildlink
Zeiss
Srb-Griturn Custom made adapters
Simonking Wildlife
Hawke
Marchwood Vortex telescopes also Meopta
Viking optical telescopes and RSPB
lakesideoptics