The Arista Premium Developing Tank  is the ideal tool for negative development. Available in single or double reel versions, the premium version includes reels made from improved plastic material and film guides to facilitate loading. Equipped with two adjustable film reels with ball ratchet system for simple and fast loading, this tank is perfect for developing color and black and white films in formats 135, 126, 127, 120 or 220. This tank will process two 35mm rolls of film or one medium format roll of film at a time.