Variable Neutral Density Filter K&F Concept KF01.1405 Adjustable Nano-C HMC Fader ND2–400 77mm

Variable Neutral Density Filter K&F Concept KF01.1405 (77 mm) is an adjustable ND filter that reduces light transmission from ND2 to ND400. Designed for 77 mm lens threads, it lets photographers control exposure in bright conditions to achieve longer shutter speeds, motion blur effects, or maintain desired aperture for depth-of-field control.

Advantages

The K&F Concept KF01.1405 uses optical glass with Nano-C HMC multi-layer coatings applied on both sides to improve image quality and provide water resistance. Its slim 7.3 mm frame and lightweight CNC-machined ring minimise vignetting and avoid upsetting tripod balance. The variable range from ND2 to ND400 offers flexible control over light reduction for a wide variety of shooting situations.

Suitable for

• Landscape photography (long exposures of rivers, waterfalls, seascapes)
• Architectural photography where controlled exposure is required
• Long exposure and motion blur effects in bright daylight
• Keeping aperture choice for shallow depth of field while reducing light

Key specifications

• Manufacturer: K&F Concept
• Model / MPN: KF01.1405
• Filter type: Variable Neutral Density (Fader ND)
• Optical thread size: 77 mm
• Light reduction range: ND2 to ND400
• Glass: Optical glass with Nano-C HMC multi-layer coating (double-sided)
• Frame thickness: 7.3 mm (slim design)

How to use

Mount the filter on a lens with a 77 mm thread and rotate the outer ring to adjust attenuation between ND2 and ND400 until the desired exposure and motion effect are achieved. Use a tripod for long exposures to avoid camera shake and check exposure with live view or a light meter. When composing, verify focus before applying heavy ND settings, then use manual focus or focus lock to prevent hunting in low-light conditions created by strong attenuation.

Usage recommendations

Keep the filter and mount threads clean to avoid spots or streaks on long exposures. Store the filter in a protective pouch when not in use and avoid overtightening the ring to preserve the slim CNC-machined frame.