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Circular glass lens filter with ultra-slim metal rim

Urth

Urth 40.5mm Circular ND4 2-Stop Lens Filter Plus+

SKU CH-YTRJ-35W0Y

40.5 mm circular ND4 filter reduces light by two stops using German SCHOTT B270 glass with 20 nano-coating layers

  • 2-stop reduction for wider apertures in bright light
  • German SCHOTT B270 glass for optical clarity
  • 20 nano-coating layers resist water, oil and scratches
  • Ultra-slim double-threaded rim prevents vignetting on wide lenses
  • No colour cast preserves true tones in every shot

Fixed ND4 Filter for 40.5mm Threads

The Urth 40.5mm Circular ND4 2-Stop Lens Filter Plus+ is a screw-on neutral density filter that cuts incoming light by two fixed f-stops. It uses German SCHOTT B270 glass with 20 layers of nano-coating to resist water, oil and scratches while maintaining high light transmission and zero colour cast. The ultra-slim, double-threaded rim allows stacking or a lens cap without vignetting on wide-angle lenses.

Best for Long Exposure

Photographers and cinematographers who need to lengthen shutter speeds or open their aperture in low-light scenes will benefit from the consistent two-stop reduction. It is not suited for situations that demand variable density adjustment or a stronger fixed reduction than the ND4 factor provides.

40.5mm Filter Thread Diameter

The filter mounts only on lenses with a 40.5mm front thread. Verify the thread size marked on your lens barrel or in its specification sheet before purchase; other thread sizes require a different filter or a step-up ring.

Highlights

  • 2-stop reduction for wider apertures in bright light
  • German SCHOTT B270 glass for optical clarity
  • 20 nano-coating layers resist water, oil and scratches
  • Ultra-slim double-threaded rim prevents vignetting on wide lenses
  • No colour cast preserves true tones in every shot

Specifications

No published specifications for this item yet.

Questions about this item

What filter thread size does the 40.5 mm ND4 Plus+ use?

The filter mounts on a 40.5 mm front thread, matching lenses marked with that diameter.

How thick is the ultra-slim rim, and will it vignette on wide angles?

The ultra-slim rim is designed to minimise vignetting, even on wider focal lengths.

How do I install the double-threaded filter without cross-threading?

Align the filter squarely, turn gently until threads engage, then rotate smoothly — forcing it is the common mistake.

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