ProMaster 67mm Circular Polarizer - Basis Power Packs while bi-color units have 648

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

Linear Response MF (manual focus) ensures that the focus ring responds directly and linearly to subtle control when focusing manually

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

Output Impedance: 600 Ohm

Portuguese (Portugal and Brazil)

ProMaster 67mm Circular Polarizer - Basis Power Packs while bi-color units have 648ProMaster 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