the whole piece, matted is 30.5x12.5 long each half of the piece is made up of a 12x5 enlargement. These were blown up on an enlarger, I just got some tight grain by a 1/2 of over exposure on Efke 25 and then changed my developing time from 5:00 to 4:30-4:45. I happened upon this by a happy accident, but I've been using it ever sense.