TTV stands for Through The Viewfinder. You use a modern digital camera (or film if you prefer) to take a photo through the viewfinder of a vintage TLR (twin lens reflex) camera. Makes a neat effect. I've been wanting to do this of the stove, I just have to find my TLR, it seems to have been lost in the moving around. It takes the lighter photos, the other one is too dark for inside pics. Taken with either an Anscoflex or Argoflex. Anscoflex is mine, it is the COOLEST camera. Looks like this: