If you are looking to shoot during the day, landscapes, around buildings and maybe even at the beach, the Laowa 49mm Circular Polarizer Lens Filter is the way to go. Polarizers increase color saturation, add contrast to all colors, and eliminate glare from highly reflected surfaces such as glass and water, creating deep, rich photos. Reflected light shows up in an image as a whitish glare that washes out the color in an image. A Polarizer rectifies this problem by eliminating glare from reflected (non-metallic) surfaces such as water and glass, creating sharper, clearer images.
Filter
The polarizer is best used at an angle 90 degrees to the source of the light and can be rotated to either increase or decrease glare and color saturation creating optimal results for all angles. This essential outdoor filter reveals details obscured by glares that is not possible to recapture through image editing, and also evenly increases color saturation without affecting the overall color balance of a shot.
Circular Polarizer
A circular polarizer works the same as a linear polarizer, but a circular polarizer is required for beam splitting metering systems commonly found in auto-focus SLR's (for most 35mm auto-focus cameras see your camera manual).
Great for outdoor photography
Saturates colors providing better contrast
Helps eliminate reflection and glare
Can be rotated to increase or decrease effect
Works properly with any metering and autofocus system