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Use the chart below to help determine which Progrey filter holder can ideally be used with your widest angle lenses before any vignetting will occur. The chart is based on the use of a double clip attached to the holder. Using a single clip attached to the holder will extend the ideal range a little further to the right. Using a triple clip attached to the holder will reduce the ideal range slightly to the left. This chart is only a general guide.

No vignette with Progrey Holders