Camera polarizing filter K&F Concept KF01.1150 — 40.5 mm circular polarizer

Circular polarizing filter K&F Concept KF01.1150 — 40.5 mm circular polarizer reduces unwanted reflections from non-metallic surfaces, improves color saturation and contrast, and helps achieve clearer images in outdoor and landscape photography. The filter attaches to lenses with a 40.5 mm front thread and is rotated to change the degree of polarization, allowing control over reflections on skies, water and foliage while preserving autofocus and exposure metering.

Advantages

The K&F Concept circular polarizer offers easy one-handed adjustment by rotating the outer ring to vary polarization strength. Its optical glass construction maintains image sharpness and minimizes color cast. The slim metal mount reduces the risk of vignetting on wide-angle lenses while providing a secure threaded connection to lenses with a 40.5 mm front thread. The filter is suitable for maintaining automatic lens functions and for use in a range of outdoor lighting conditions.

Suitable for

• Landscape photography to deepen blue skies and enhance cloud definition
• Reducing reflections on water, glass and wet foliage
• Outdoor portrait and travel photography where improved color saturation is needed
• Use with lenses that have a 40.5 mm front thread

Key specifications

• Filter type: circular polarizer (CPL)
• Thread size: 40.5 mm
• Mount material: slim metal ring designed to limit vignetting
• Optical element: multi-coated glass to reduce flare and reflections
• Operation: rotatable outer ring for adjustable polarization

How to use

Screw the filter onto the lens front thread until it is secure but not overtightened. Compose the shot and then rotate the outer ring while observing through the viewfinder or live view to find the desired reduction of reflections and saturation level. For maximum effect when shooting skies, position the camera with the sun at approximately 90 degrees to the lens axis. Keep the filter clean and store it in a protective case when not in use to preserve coatings and mechanical smoothness.

Usage recommendations

Use the circular polarizing filter when shooting scenes with reflective surfaces or when you need richer colors and improved contrast. Avoid using strong polarization with ultra-wide lenses at close focal lengths if noticeable uneven polarization appears across the frame.