The MOD 54 is a clever piece of construction that allows up to 6 sheets of 5"x4" film to be processed in a standard Paterson Multi-Reel 3 tank. This is the shortest of the Multi-Reel tanks, which when used with spirals, will process 3 x 35mm or 2 x 120. Standard agitation techniques can be used. The tank will use a standard 1 litre of solution, which will fully cover the films. Normal agitation of a few inversions twice a minute will work for most applications, but test before undertaking critical work.