Canon Anti-Fog Eyepiece EG
Product Description
  The Eg Anti-Fog Eyepiece for Select Canon DSLRs from Canon fits
 various Canon digital SLR cameras and uses specially treated 
advanced-process glass which prevents condensation or fogging. It is 
designed for use in warm and humid or cold weather, when fogging is most
 likely to occur.
Compatibility
EOS-1D Mark III
EOS 1D Mark IV
EOS 1Ds Mark III
EOS 7D Cameras 

                        