Sigma

Sigma AFB9C0 55mm WR CPL Filter - Circular Polarizer

Name: Sigma AFB9C0 55mm WR CPL Filter - Circular Polarizer
Brand: Sigma
SKU: AFB9C0

★★★★★4.3 (35 reviews)

Cut glare and boost color saturation in any weather with Sigma's water-repellent 55mm circular polarizer.

$93.28*

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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Sigma AFB9C0 55mm WR CPL Filter is a circular polarizing filter designed to help photographers manage reflections, enhance color vibrancy, and improve contrast in their images. By rotating the filter's outer ring, you can control how much polarization is applied — reducing glare from water, glass, and other non-metallic surfaces while deepening blue skies and making foliage appear richer and more saturated. These effects are optical and happen at the time of capture, producing results that are difficult to replicate convincingly in post-processing.

What sets this filter apart from basic polarizers is its water-repellent coating. The WR treatment causes moisture to bead and slide off the glass surface, which is a practical advantage for landscape and outdoor photographers who frequently encounter rain, sea spray, or morning dew. The filter also serves as a protective barrier for your front lens element, shielding it from dust, fingerprints, and minor impacts during everyday use.

Key Features

CPL

New Concept Filters that suit the high optical performance

Weather Resistant

Specifications

Brand

Sigma

Model

AFB9C0

Filter Size

55mm

Filter Type

Circular Polarizing (CPL)

Coating

Water-Repellent (WR)

Pros & Cons

👍 Pros

Water-repellent coating keeps the filter surface clear during rain, fog, or humid shooting conditions.
Effectively reduces reflections from non-metallic surfaces like water, glass, and foliage.
Enhances color saturation and contrast, particularly in skies and outdoor landscapes.
Doubles as a protective front element for your lens against scratches and dust.

👎 Cons

Reduces light transmission by approximately 1-2 stops, which can be a limitation in low-light situations.
Only fits lenses with a 55mm filter thread — requires step-up rings for other sizes.
Polarization effects are most pronounced at 90 degrees to the sun and may appear uneven on ultra-wide-angle shots.

Frequently Asked Questions

What does the water-repellent coating on this filter do?

The WR coating causes water droplets to bead up and roll off the filter surface, making it easier to shoot in rain, mist, or humid conditions without water spots degrading your images.

How do I adjust the polarization effect?

Simply rotate the outer ring of the filter while looking through your viewfinder or at your live view screen. The polarization effect changes as you rotate, letting you dial in the exact amount of glare reduction you want.

Will this filter cause vignetting on wide-angle lenses?

At 55mm thread size, vignetting is unlikely on most standard and telephoto lenses. However, on ultra-wide-angle lenses, some corner darkening may occur depending on the focal length.

Does the filter reduce the amount of light entering the lens?

Yes, circular polarizing filters typically reduce light transmission by about 1 to 2 stops, which may require slight adjustments to your exposure settings.