Look up: USM

1. USM
   USM (Ultra Sonic Motor) is a Canon devised Autofocus SLR lens motor system. USM lenses are usually quicker to focus, more compact, with greater operational simplicity and virtually silent compared to their earlier 'Arc Form Drive'(AFD) cousins. USM lenses only work with the Canon 'EOS' camera system, introduced in March 1987. (see SLR & EOS)
   Found on http://www.peterashbyhayter.co.uk/glossa
   
   
2. USM
   Universal Subscription Mechanism. Allows certain podcatchers to automatically add a subscription from an RSS file.
   Found on http://www.podcastfm.co.uk/podcasting_gl
   
   
3. USM
   Unlisted Securities Market (USM) set up in 1980 to provide an easier route to the market for small or new companies. The market closed at the end of 1996. (USM companies could move to the main market or AIM.)
   Found on http://www.londonstockexchange.com/globa
   
   
4. USM
   ( Unsharp Mask ) The term comes from a conventional colour separation camera technique that uses a unsharp photographic mask to increase contrast between light and dark areas of the reproduction and gives the illusion of sharpness.
   Found on http://www.rodsmith.org.uk/photographic%
   
   
5. USM
   ( Unsharp Mask ) The term comes from a conventional colour separation camera technique that uses a unsharp photographic mask to increase contrast between light and dark areas of the reproduction and gives the illusion of sharpness
   Found on http://www.digitalexposure.ca/sub1.html