Adjustable ND Filter K&F Concept KF01.1400 55mm ND2–ND400

Adjustable ND Filter K&F Concept KF01.1400 55mm (ND2–ND400)

The K&F Concept KF01.1400 adjustable neutral density filter reduces the amount of light entering the lens to allow longer exposures, motion blur effects and wider apertures in bright conditions. It fits lenses with a 55 mm front thread and provides a variable density range from ND2 to ND400 for flexible exposure control when shooting landscapes, waterfalls, rivers and other scenes that benefit from slow shutter speeds.

Advantages

The filter uses optical glass and is finished with a double-sided, multi-layer blue coating that improves image quality and provides water resistance. Its slim profile (7.3 mm frame thickness) and super-light CNC ring reduce bulk and help preserve tripod balance. The adjustable density range gives precise control over exposure without changing lenses or stacking fixed ND filters.

Suitable for

• Landscape photography
• Long exposure shots (water, clouds, light trails)
• Creating motion blur and silky water effects
• Video work requiring exposure control in bright light

Key specifications

• Manufacturer: K&F Concept
• Model / MPN: KF01.1400
• Thread size: 55 mm
• Density range: ND2 to ND400 (variable)
• Glass type: Optical glass
• Filter frame thickness: 7.3 mm

How to use

Attach the filter to the front thread of a compatible 55 mm lens and rotate the filter ring to adjust the neutral density level between ND2 and ND400. Compose and focus the scene before applying very strong attenuation; for very long exposures use a tripod and remote shutter or camera timer to avoid camera shake. Check exposure with live view or a histogram and make incremental adjustments to the filter rotation until the desired shutter speed or aperture is reached.

Usage recommendations

For best results when photographing moving water or skies, use a sturdy tripod and low ISO. When using the filter at extreme densities, verify focus and white balance before the final exposure and consider using exposure bracketing for safety.