The Honeycomb Grids are designed to produce 3 different sizes of light spread (Small, Medium and Large). When aligned and stacked, two grids together produce the smallest spread. Stack the small grid into the bezel to produce larger spreads and for medium size spread, stack the largest grid into the bezel. SG-CII is designed to fit Canon 580EX, 580EX II, 600EX-RT YONGNUO YN560 IV, YN600EX-RT
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