Some links you may find useful and informative

 

 

 

BIPP Index to Professional photography
RPS Royal Photographic Society Home Page
FUJI Professional Imaging
KODAK Home Page  
NIKON Home Page  
MAMIYA Cameras etc  
HASSELBLAD Cameras etc  
SRB
The adaptor Factory & Filter Emporium
 
Comley Cameras Digital & Traditional Photo Supplier  
ILFORD
The home of Black/WhitePrinting