12 Stops High quality optical glass. 100*100mm(4*4'') Approx. 2.0mm thickness. Fits to Haida 100 series insert (square) filter holder (Model No.: HD2500).
12 Stops High quality optical glass. 100*100mm(4*4'') Approx. 2.0mm thickness. Fits to Haida 100 series insert (square) filter holder (Model No.: HD2500).