Filter Nd1000 Polarpro Quartzline For 77mm Lenses - -

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Filters of the highest quality.
Different types, many possibilities Handmade 4-part frame, allows smoother Filter adjustment than a frame made of aluminum.
Durable glass Quartzline B270 Plastic Refractive index 1.456 1.523 1.58 Surface reflectance 0.034 0.042 0.056 Stress-relief temperature 1120°C 510°C 463°C Robust quartz glass Low reflective surface resistant to extreme temperatures and a refractive index of only 1.456.
Filters of the highest quality