ProMaster 67mm Circular Polarizer - Basis Power Packs Lav-Headset Specifications:

Lav-Headset Specifications:

Output Impedance: 600 Ohm

(35mm format equivalent) f=90mm　(137mm) Angle of view 17

Silver umbrellas may also add ½-1 f/stop of light output

while bi-color units have 648 daylight LEDs and 648 tungsten LEDs

ProMaster 67mm Circular Polarizer - Basis Power Packs Lav-Headset Specifications:ProMaster 67mm Circular Polarizer Basis ProMaster SKU: 70435 Helix SKU: PR704353 OVERVIEW The ProMaster 67mm Basis filter can be used to remove or control reflections, improve contrast & saturation, or darken blue skies. A CPL filter is a valuable creative tool. Its quality should complement your lens by handling light well and providing a clear, sharp image to the cameras digital sensor of film. Polished optical glass, a special multi coating