Neutral density camera filter Kenko 037157 — 3.7 cm, single-piece, black

Kenko 037157 neutral density camera filter with a 3.7 cm diameter is a single-piece, black optical filter that reduces the amount of light entering the lens without altering color balance. Designed for photographers who need controlled exposure in bright conditions, this neutral density (ND) filter enables longer shutter speeds and wider apertures while preserving natural colors. The filter is supplied as one unit and fits lenses with a matching 3.7 cm filter seat.

Advantages

The neutral density filter provides an 8× light reduction that allows photographers to extend shutter speed by up to eight times compared with unfiltered exposure, enabling motion blur effects and smoother water or cloud rendering. It reduces exposure uniformly across the visible spectrum so color reproduction remains neutral. The single-piece black design is compact and easy to mount, offering a simple way to control depth of field and creative blur in bright outdoor conditions.

Suitable for

• Creating motion blur in waterfalls, rivers, or moving foliage
• Reducing light to use wider apertures for shallow depth of field in daylight
• Long-exposure landscape and seascape photography
• Urban night scenes where controlled exposure and motion smoothing are required

Key specifications

• Filter type: Neutral density (ND)
• Nominal light reduction: 8× (approximately 3 stops)
• Optical element: single-piece construction
• Finish: black
• Outer diameter / mounting size: 3.7 cm

How to use

Attach the filter to a compatible lens with a 3.7 cm filter mount before composing the shot. Select a shutter speed slower than the unfiltered exposure to achieve the desired motion effect or to allow use of a wider aperture in bright light. Use a tripod or other stabilization when making long exposures to avoid camera shake. Check exposure with the camera’s meter and adjust ISO, aperture, or shutter speed as needed to reach correct exposure while maintaining the intended creative effect.

Usage recommendations

For best results, pair the filter with stable support (tripod), mirror lock-up or electronic front curtain shutter if available, and low ISO settings to minimize noise. When combining with other filters, ensure secure mounting and verify that vignetting does not occur on wide-angle lenses.