ELMA 023-4510 Knob, Round Shaft, 6.35 mm, Nylon (Polyamide), Round with Indicator Line, 21 mm Pioneer Photo Albums JPF Type Blue Size 4x4" (100

ELMA 023 4510 Knob, Round Shaft, 6.35 mm, Nylon (Polyamide), Round with Indicator Line, 21 mm Pioneer Photo Albums JPF Type Blue Size 4x4" (100 Type Blue Size 4x4" (100 x 100 mm) Grade 47 Filter Factor 6 (+2 2 3 stops) Multi Coated No Rotating No Effect Accentuates fog and haze Application Used in dye transfer printing and for contrast effects (lightens blue tones) Color Temperature Not specified Construction Glass Front Filter Thread Size Not applicable Front Lens Cap Size Not applicable Warranty Ten Years Packaging Info Package Weight 0 It also facilitates fine focusing when shooting portraits with a shallow depth of field