Hi Clive It will cover 16x20. But you push it if you try 24in. in width Ken ******Ken Hough Photographic Repair****** Specializing in Deardorff Refinishing Lens Recementing and Shutter repair Contribitor to McKeowns Price Guide Deardorff Section Custom machined Photographic items Text Contents Copyright 1999 KHPR http://deardorffcameras.0catch.com/ Est. 1980