K&F 49MM C Series Magnetic CPL Filter,Reflection Green Film,With magnetic mount,

C Series Magnetic — polarising filter 49 mm, cuts reflections and deepens colour.

• 18 anti-reflective layers, reflectance 0.6 %
• Magnetic mount — on and off in a second
• The surface repels water and grease and resists scratches

A polarising filter takes the glare off water, glass and foliage, and with it brings out the colours that were hiding underneath. The sky darkens, clouds stand out, leaves stop flaring white and you can see through the surface of water. The effect is set by rotating the filter and is strongest at right angles to the sun; it cannot be recreated in post, because it is a property of the light rather than a colour in the file.

The glass carries 18 anti-reflective layers and reflects only 0.6 % of the light, so no ghosting or veiling appears against the light.

The filter goes on magnetically — a magnetic adapter ring screws onto the lens and the filter holds itself on. A swap takes a second and nothing has to be screwed.

The surface repels water and grease, so drops run off and fingerprints wipe away without smears; the coating also stands up to cleaning in the field.