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37mm circular ND4 filter with ultra-slim rim and Schott B270 glass

Urth

Urth 37mm Circular ND4 2-Stop Lens Filter Plus+

SKU CH-B767-E2AGQ

37mm circular ND4 filter reduces light by two stops for long exposures and wider apertures, using German SCHOTT B270 glass with 20-layer nano-coating and an ultra-slim double-threaded rim

  • 2-stop light reduction enables longer exposures
  • German SCHOTT B270 glass for optical clarity
  • 20-layer nano-coating resists water oil scratches
  • Ultra-slim rim prevents vignetting on wide lenses
  • Double-threaded design allows filter stacking

Fixed ND4 2-stop light reduction

This 37mm circular filter cuts incoming light by two full stops, giving photographers and cinematographers precise control over long exposures and depth of field. It enables wider apertures in bright conditions without overexposure, creating shallow depth of field for stills or cinematic motion blur for video. The fixed density suits users who want a single, reliable strength rather than a variable filter.

20-layer nano-coating on SCHOTT B270 glass

German SCHOTT B270 glass provides the optical base, while 20 layers of nano-coating boost light transmission and deliver a consistent transmission curve for true colour rendition with no colour cast. The coating repels water, oil and fingerprints, making the surface easier to clean and more resistant to scratches during regular handling. An ultra-slim rim minimises vignetting on wide-angle lenses.

Double-threaded for stacking and caps

Both front and rear threads accept standard 37mm accessories, so you can stack additional filters or keep a lens cap on while the filter remains mounted. This design suits workflows that combine ND with circular polarisers or protective filters. Buyers needing variable density, graduated transitions or thread sizes other than 37mm should choose a different filter.

Highlights

  • 2-stop light reduction enables longer exposures
  • German SCHOTT B270 glass for optical clarity
  • 20-layer nano-coating resists water oil scratches
  • Ultra-slim rim prevents vignetting on wide lenses
  • Double-threaded design allows filter stacking

Specifications

No published specifications for this item yet.

Questions about this item

How do I install the 37mm filter onto my lens without cross-threading the ultra-slim rim?

Align the filter threads squarely with the lens front thread and turn gently until it seats; the ultra-slim rim has less grip surface, so avoid forcing it if resistance appears early.

How should I maintain the 20-layer nano-coating and when might the filter need replacement?

Clean with a microfibre cloth and lens fluid; the coating resists water, oil and scratches, but replace the filter if the glass chips or the coating degrades enough to affect image quality.

What limit appears first when using the ND4 2-stop filter for very long exposures in bright light?

The fixed 2-stop reduction may still allow too much light for the desired shutter speed, requiring a stronger ND filter or smaller aperture to avoid overexposure.

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