veiwfinder 

its the clear little square on a camera u look through to take a picture.

u look through the veiwfinder when u take pictures on a ceep camera that uses film.

veiwfinder by amazing me!(: February 19, 2011

mental viewfinder

Seeing an image in public so hot that you catalog it in your memory for masturbating later.

Holy shit I was behind Susan in yoga today. I totally put that in my mental viewfinder for tonight’s wank.

mental viewfinder by timbre December 5, 2013

null used viewfinder 

A null used viewfinder is a catch-all term to describe the sort of arty bollocks-speak one might observe being written or spoken by pretentious arty types. Named for a particularly pretentious photographer who used it in a caption for one of his (spectacularly dire) photographs. Also rendered as 'used viewfinder, null', or 'used null viewfinder'.

"Did you see what that artist bloke, John B. Smith-Smith was saying in his column in the Guardian the other week?" "I read it, yeah, but there were too many null used viewfinders to be able to understand what he was on about. Pretentious gimp."

null used viewfinder by Wowbagger (the Infinitely Prolonged) June 11, 2003