Schneider Electric circular polarizer filter C-Pol 37mm (Praktica series)

The Schneider Electric circular polarizer filter C-Pol 37mm (Praktica series) is a screw-in lens accessory designed for lenses with a 37 mm filter thread. This circular polarizing (C-Pol) filter reduces reflections and glare from non-metallic surfaces, increases color saturation, and improves contrast in skies and foliage. Housed in a metal screw-in frame, it attaches directly to compatible Praktica-series lens threads for straightforward use in landscape, travel and general outdoor photography.

Advantages

The circular polarizer selectively filters polarized light to suppress reflections on water, glass and wet surfaces while preserving natural color tones. It enhances blue sky contrast and deepens greens for more defined landscape images. The compact 37 mm metal frame is durable and provides secure, threaded attachment without adding significant bulk to the lens. As a true circular polarizer, it remains compatible with lens autofocus and exposure metering systems that require circular polarization.

Suitable for

• Landscape and nature photography to increase sky contrast and color saturation
• Outdoor scenes with water, glass or wet surfaces where reflection control is needed
• Travel and street photography when managing glare from windows or reflective surfaces
• General-purpose lens accessory for Praktica-compatible optics with 37 mm thread

Key specifications

• Type: Circular polarizing filter (C-Pol)
• Mount: 37 mm screw-in metal frame for lens filter threads
• Material: Optical polarizing glass in a metal threaded ring
• Function: Reduces reflections, increases color saturation and sky contrast
• Compatibility: Lenses with 37 mm external filter thread (Praktica-series compatible)

How to use

Screw the filter into the lens filter thread until finger-tight to avoid cross-threading. Rotate the front ring of the circular polarizer while observing the viewfinder or live view until the desired reduction in reflections or increase in color saturation is achieved. For maximum sky darkening, rotate the filter until the most contrast between sky and clouds appears. When shooting through glass or at shallow angles to water, adjust rotation to minimize unwanted reflections. Remove the filter by carefully unscrewing it when not in use and store it in a protective case to prevent scratches.

Usage recommendations

Use the filter at rectangular angles to reflective surfaces for strongest polarization effect; effectiveness decreases when shooting toward or away from the sun. Metering and autofocus remain effective with circular polarizers, but exposure may require slight adjustment—check histograms or exposure preview when available.