S.V.E. 4" focus series 0 special , cool periscope effect, fits directly into an Alphax or Betax #3 shutter (I tried it on my Betax/5x7). check the photo of the effect. Comes with clear optical glass front element (protects the front of the shutter) scan of 5x7 contact print using the lens Will trade for a modern 5x7 film holder. $30 plus shipping.