K&F 49mm Variable Neutral Density Filter (ND2–ND2000) Fader Gray, Nano-C KF01.2439

The K&F 49mm Variable Neutral Density Filter (ND2–ND2000) Fader Gray, Nano-C KF01.2439 is a threaded optical accessory designed for cameras with 49 mm filter threads. It provides continuous light reduction across a wide range, enabling control over exposure without changing aperture or ISO. The Nano-C coating minimizes reflections and maintains color balance while the variable density mechanism allows gradual adjustment from light to very strong attenuation, suitable for stills and video work where precise light control is required.

Advantages

This K&F variable ND filter delivers flexible exposure control by offering a continuous ND range from ND2 to ND2000, so photographers and videographers can fine-tune light intake without swapping multiple fixed filters. The Nano-C coating reduces surface reflections and helps preserve accurate color rendition. The compact 49 mm threaded design is lightweight and compatible with lenses that accept 49 mm filters, making it easy to mount, rotate, and use for creative effects such as motion blur and long exposures. Its stepless adjustment supports smooth transitions during filming and allows using wider apertures in bright conditions.

Suitable for

• Long exposure landscape and seascape photography
• Motion blur effects for waterfalls, rivers, and traffic
• Video work requiring smooth exposure changes and shallow depth of field
• Outdoor portraiture in bright light when wider apertures are desired
• Time-lapse sequences needing controlled exposure across frames

Key specifications

• Filter type: Variable Neutral Density (stepless)
• Optical density range: ND2 to ND2000 (approx. 1 to 11 stops attenuation range)
• Thread size: 49 mm
• Surface treatment: Nano multi-coating to reduce reflections and maintain color fidelity
• Mount: Threaded ring compatible with standard 49 mm filter threads
• Construction: Thin, low-profile frame for reduced vignetting on wide-angle lenses

How to use

Attach the K&F 49mm variable ND filter to the front of a lens with a matching 49 mm thread and confirm a secure fit. Rotate the outer ring to adjust the density progressively until the desired exposure level, motion blur, or depth of field is achieved. When composing for long exposures, use a tripod and a remote shutter release or camera timer to avoid camera shake. For video, make slow, deliberate adjustments to the filter ring to ensure smooth exposure transitions. Verify color balance in test shots and adjust white balance if necessary.

Usage recommendations

To minimize cross-polarization or X-pattern artifacts at extreme settings, avoid combining the filter at maximum density with other filters or extreme wide-angle focal lengths; instead, use moderate density settings when possible and check results on the camera preview. Clean the glass with a microfiber cloth and lens-safe cleaner before use to maintain image quality. Store the filter in its protective case when not in use to prevent scratches and dust accumulation.