B01JPNZ7T6 58mm Variable Neutral Density NDX Filter for Pentax Wide Angle SMCP-FA 31mm f/1.8 AL

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Provides Total Versatility in Neutral Density
Adjustable From ND2 – ND1000
Have Control of Any Lighting Environment
Simply Turn Its Exterior Ring to Access Any of the Neutral Density Settings
Save Time Changing or Adding Filters