Bring Professional Exposure Control to Your Smartphone Camera

Smartphone cameras continue to evolve at an incredible pace, yet they still face a fundamental photographic limitation: there is no built-in way to reduce incoming light optically. The K&F Clip-On Variable ND2–32 Filter solves this by giving mobile photographers and videographers the exposure control traditionally reserved for DSLR and mirrorless systems. Whether you are shooting cinematic video, long-exposure stills, or simply trying to prevent blown highlights in bright daylight, this filter provides the flexibility you need. Designed for both professionals who want dependable results and enthusiasts seeking more creative freedom, it adds a level of practical control that software-based effects cannot replicate.

Variable Neutral Density Control
A variable ND filter works by reducing light before it reaches the sensor, enabling you to maintain slower shutter speeds or wider apertures even under intense sunlight. With an ND2–32 range, you can cut between one and five stops of light using a single rotating filter ring. This gives you real-time feedback as you adjust exposure on-screen. For video shooters, it provides the consistency needed to follow the 180-degree shutter rule, retaining smooth motion and accurate rendering of movement. For still photographers, the control is equally valuable when capturing water motion, soft clouds, or shallow depth of field in bright conditions. Instead of relying on digital workarounds or pushing your phone’s computational processing, you create the look optically, ensuring a cleaner and more natural final image.

Purpose-Built for Mobile Workflows
The 67mm diameter is engineered to accommodate phones with larger multi-camera modules. By covering the entire array, it allows seamless shooting across ultra-wide, main, and telephoto lenses without repositioning the clip. This is particularly helpful when using lens-switching modes in video, where consistency and stability matter. The universal clip design ensures compatibility with virtually any smartphone, whether current flagship models or older devices. The clip’s rubber padding protects the phone surface while maintaining a firm hold, allowing confident use during travel, outdoor shoots, or quick run-and-gun filming.

Optical Quality and Coating Technology
K&F’s Japanese optical glass forms the core of the filter, providing a clean, neutral colour response and excellent sharpness. The Nano-K coating reduces internal reflections that often cause veiling glare or washed-out contrast, especially when shooting around reflective surfaces. It also repels moisture and fingerprints, helping you maintain clean glass even in humid environments or when adjusting the filter frequently during a shoot. The polished optical surfaces preserve the fine detail modern phone sensors can resolve, ensuring you are not sacrificing clarity while gaining exposure control.

Build Quality and Handling
Even with its large 67mm diameter, the filter remains lightweight and practical to carry. The rotating ring moves smoothly with enough resistance to maintain your chosen setting yet not so tight that adjustments become difficult. This is important when making fine exposure corrections while filming or when transitioning between lighting conditions. The clip mechanism is built from durable materials designed to withstand regular use, with stable tension that keeps the filter flat and parallel to the phone lenses. The hardshell carry case offers reliable protection during transport, preventing scratches or impact to the glass.

How to Use the Variable ND Filter
Setup is straightforward. Clip the mount over your phone’s camera cluster, align the filter so all lenses are unobstructed, and rotate the front ring to select the desired density. For video, start around ND8 or ND16 under bright sunlight and adjust until your shutter speed achieves natural motion rendering. For photography, experiment with ND16 or ND32 when capturing waterfalls, rivers, or scenes where you want movement to appear smooth and flowing. Because optical ND filters control light before the sensor captures the image, your phone’s stabilisation and dynamic range performance remain consistent, resulting in higher-quality output than digital effects can typically achieve.

Creative Applications
Variable ND opens a wide range of creative approaches. Urban shooters can use slower shutter speeds to blur pedestrian movement, adding energy to city scenes. Coastal photographers can smooth waves or soften water surfaces while preserving the crisp detail of surrounding rocks and shoreline structures. Landscape shooters can craft images with balanced exposure and controlled highlights even under harsh midday light. Content creators filming outdoors will find it essential for preventing overexposure while maintaining the cinematic look that smartphone video modes are capable of producing. By adjusting density fluidly, you explore more nuanced creative choices without needing multiple separate filters.

What Sets It Apart
While many mobile accessories offer convenience, few provide the kind of genuine optical control that meaningfully improves image-making. This clip-on variable ND system brings a proven professional technique into the mobile space with thoughtful engineering and solid optical performance. The larger 67mm size ensures compatibility with modern camera arrays, and the ability to attach any additional 67mm filter expands your creative options beyond ND alone. The combination of build quality, ease of use, and reliable exposure adjustment makes it a practical, long-term tool for your mobile kit.

Included Items and Practical Value
Beyond the filter itself, the set includes a protective case and cleaning cloth, small additions that make a noticeable difference in field use. The case prevents damage when stored in a backpack or camera sling, while the cloth ensures you can maintain clarity despite frequent handling. These items support the usability and durability of the filter, reinforcing its value as a long-term investment for improving your photography and videography.

Whether you are producing travel videos, experimenting with long exposures, or seeking consistent image quality across changing lighting conditions, the K&F Clip-On Variable ND2–32 Filter helps you achieve controlled, balanced, and visually refined results. It enhances the optical capability of your smartphone in a practical, immediately useful way. Order the KF01.2901V2 today and expand what your mobile camera can do.

SPECIFICATIONS:
• Filter Type: Variable Neutral Density ND2–32
• F-Stops: 1 to 5
• Material: Nano-K Series Optical Glass, Aluminium Alloy Frame, Plastic Clip
• Coating: Multi-layer Nano-K Coating
• Adjustment Method: Rotating front ring
• Compatibility: Designed to cover large multi-lens smartphone camera clusters; accepts 67mm threaded filters
• Clip-on Design: Universal clamp suitable for most smartphones
• Dimensions (Filter): Ø 6.7 cm (67 mm)
• Weight (Filter): 21 g
• Weight (Clip): 18 g
• Weight (Assembled): 39 g