Urth 49mm ND2-400 Variable ND Lens Filter - Ultra-Slim, Locking Rim

In this review the Urth 49mm ND2-400 Variable ND Lens Filter is evaluated for outdoor photographers who need flexible light control without swapping glass. The bottom line: this filter is most useful for nature and landscape shooters wanting a shallow depth of field or long exposure capability in changing light because its wide 1 to 8.6 stop range and locking rim let you dial exposure precisely while avoiding the common X-effect. Construction and optical quality are the clearest reasons to consider it.

Key Features

• Wide stop range: The ND2-400 range provides up to 8.66 f-stops of light reduction so photographers can create long exposures and strong motion blur in bright conditions.
• Locking rim: The min-max locking mechanism prevents over rotation and helps avoid the X-effect when shooting at higher density settings.
• Superior glass: The 8-layer nano-coated Japanese AGC glass improves transmission and resists flare and reflections for cleaner images.
• Ultra-slim design: The thin rim minimizes vignetting on wide-angle lenses and keeps the optical footprint compact for landscape work.
• Durable construction: Magnalium metal build delivers rigidity and longevity and the product is backed for life for long-term reliability.

Who It's For

This filter is aimed at photographers who regularly shoot sunrises, sunsets, rivers or seascapes and need flexible neutral density control without carrying multiple fixed ND filters. It is particularly useful for those who like to preserve a shallow depth of field in bright light or want to work with multi-second exposures for motion effects.

It may be less suitable for photographers who demand ultra-precise color neutrality for scientific imaging or for users whose lenses require larger threads than 49mm; those users should consider other sizes or dedicated fixed ND glass for the tightest color control.

Pros & Cons

Pros

• Solid build quality and a slim rim that reduces vignetting on wide lenses.
• Effective locking rim and smooth adjustment make it easy to change density without overshooting exposure.
• Good value given the combination of nano-coated Japanese AGC glass and durable magnalium construction.

Cons

• Variable ND designs can introduce a slight color shift or X-pattern at extreme settings; careful framing and checking white balance helps mitigate this.

Specifications

Filter type	Variable Neutral Density (ND2-400)
Stop reduction	1 to 8.66 f-stops (ND2-400 range)
Thread size	49mm
Glass	8-layer nano-coated Japanese AGC glass
Frame material	Magnalium, ultra-slim rim
Special feature	Min-max locking rim to prevent over rotation
Warranty	Lifetime quality backing

Our Verdict

The Urth 49mm ND2-400 is a practical, well-built variable ND for landscape and nature photographers who need rapid, reliable control over exposure and depth of field. Its combination of nano-coated AGC glass, locking rim and slim profile makes it a strong value for most creative shooters, provided you check for minor color shifts at the densest settings.

Frequently Asked Questions

Will this cause vignetting on wide-angle lenses?
Because of the ultra-slim rim design vignetting is minimized on most wide-angle setups, but extreme wide lenses with adapters can still vignette.

Does the locking rim eliminate the X-effect?
The min-max locking mechanism prevents over rotation and greatly reduces the chance of the X-effect, though careful framing at high densities is recommended.

Is the glass scratch resistant?
The 8-layer nano coating improves resistance to flare and makes cleaning easier, but normal care is still recommended to avoid scratches.