C Clicker Guest Oct 21, 2008 #1 How to figure closeness of these tubes, A 12mm extension, 20mm extension and a 36mm extension give in regards to a 28-80mm Lens, 17-35mm wide angle and a 75-300mm Lens.
How to figure closeness of these tubes, A 12mm extension, 20mm extension and a 36mm extension give in regards to a 28-80mm Lens, 17-35mm wide angle and a 75-300mm Lens.
