Gauge your exposure times to perfection with an exposure calculator. it eliminates any guess work, especially when bulbs start to degrade. AMEX Exposure Calculator is a film with 5 columns. Each column has a resolution target, a set of half-tone tints and lines of text. Each column is marked with a factor number and four columns are backed with a UV grey neutral filter of different density. It can also be used to assess the print edge definition and the print resolution. The target is designed to allow the user to select the best angle to position the stencil. Resolution is checked by assessing the degree of “filling-in” at the centre of each target.
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If you're starting out or just changed your exposure unit/emulsion, these come in handy. We use ours whenever we're trying new things and recommend it as you'll save a lot of guesswork AND MONEY