Lens Filter K&F Nano-X 43 mm (model XV38) — screw-in optical filter, 43mm thread

The K&F Nano-X 43 mm (model XV38) is a screw-in optical filter designed for lenses with a 43 mm filter thread. This compact, lightweight filter from K&F Concept offers a simple way to protect the front element of compatible lenses and to make basic adjustments to incident light. The filter is intended for photographers who need a low-profile threaded accessory that integrates with existing 43 mm lens systems and everyday photographic workflows.

Advantages

The Nano-X glass provides a durable protective surface that reduces the risk of dust, fingerprints and scratches on the lens front element while maintaining image clarity. Its screw-in design ensures a secure mechanical connection with lenses that have a 43 mm thread without adding significant bulk. The slim profile minimizes vignetting on wide-angle lenses and allows stacking with other 43 mm threaded accessories when required.

Suitable for

• Protecting the front element of 43 mm-threaded lenses during transport and everyday use
• Basic light control to reduce stray light and improve contrast in casual shooting situations
• Integration into a kit of 43 mm threaded accessories such as step-up rings or converter adapters

Key specifications

• Filter diameter: 43 mm screw-in thread
• Mount type: threaded screw-in for lenses with 43 mm filter thread
• Construction: optical glass element in a slim metal ring
• Profile: low-profile design to reduce potential vignetting
• Weight: compact and lightweight for minimal impact on balance and handling

How to use

Align the filter’s threaded ring with the lens’ 43 mm filter thread and turn clockwise until it is snug; avoid overtightening. Use the filter as a protective element during storage and transport, and keep it in place during casual shooting to reduce the chance of surface damage. When stacking multiple threaded accessories, install the filter first or according to the accessory manufacturer’s recommendations to ensure proper fit and avoid cross-threading.

Usage recommendations

Clean the filter surface with a soft microfiber cloth and a suitable lens-cleaning solution to maintain optical performance. Store the filter in a protective case when not in use and check thread alignment before mounting to prevent damage to lens and filter threads.