The Collaborative International Dictionary of English v.0.48:

Telephoto \Tel`e*pho"to\, a.
   1. of or relating to photography with a telephoto lens.
      [PJC]

   2. of or pertaining to a telephoto lens.
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

telephoto \telephoto\ n.
   1. a telephoto lens.
      [PJC]

   2. a photograph taken using a telephoto lens.
      [PJC]

WordNet (r) 3.0 (2006):

telephoto
    n 1: a photograph made with a telephoto lens [syn:
         telephotograph, telephoto]