Calumet CPL SMC 67 mm Ultra Slim 28-Layer Circular Polarizing Filter

The Calumet CPL SMC 67 mm Ultra Slim 28-Layer Circular Polarizing Filter is a photographic accessory designed to reduce unwanted reflections, suppress glare and enhance color saturation and contrast in outdoor and studio shots. With a 67 mm diameter and an ultra-slim frame, this circular polarizer is intended to fit lenses that accept 67 mm filter threads while minimizing vignetting on wide-angle optics. The 28-layer multi-coating improves light transmission and reduces internal reflections for clearer, more natural-looking images.

Advantages

The ultra-slim frame reduces the risk of mechanical vignetting on wide-angle lenses while allowing the filter to be used with lens hoods and stacked filters in many setups. The 28-layer multi-coating provides enhanced resistance to flare and ghosting, improves contrast and preserves color fidelity. The circular polarizing design enables adjustable polarization by rotating the front ring, giving precise control over reflections from non-metallic surfaces and enhancing sky and foliage saturation.

Suitable for

• Landscape photography where skies and water reflections require control
• Outdoor and travel photography to increase color saturation and reduce glare
• Product and still-life shoots to suppress surface reflections and reveal textures
• Wide-angle lens use where a slim filter profile is needed to avoid vignetting

Key specifications

• Filter type: Circular polarizer (CPL)
• Diameter: 67 mm
• Frame profile: Ultra-slim to reduce vignetting on wide-angle lenses
• Coating: 28-layer multi-coating to reduce reflections and improve transmission
• Mounting: Screws onto 67 mm lens filter thread

How to use

Attach the filter to a lens with a 67 mm filter thread by screwing it gently into place. Rotate the outer ring while looking through the viewfinder or at the live view screen to adjust the degree of polarization until reflections are reduced or sky contrast is enhanced as desired. When composing wide-angle shots, check for potential vignetting; the ultra-slim frame is designed to minimize this, but rotation and stacking additional filters may reintroduce shading. Clean the coated surfaces with a soft microfiber cloth and appropriate lens-cleaning solution to maintain optical performance.

Usage recommendations

Use the filter outdoors for controlling reflections from water, glass and foliage and to deepen sky tones. Remove or use a thin adapter when stacking multiple filters to avoid vignetting. Store the filter in a protective case and avoid touching coated surfaces directly to preserve the 28-layer coating.