Square ND4 4in x 5.65in Matte Box ND Filter - 2 Stops

Our review of the Square ND4 4in x 5.65in Matte Box ND Filter finds it most useful for filmmakers and videographers who need simple, reliable exposure control when using a matte box. Mounted in a Tilta or SmallRig matte box, this ND4 (0.6) filter reduces light by two stops to help maintain desired shutter speed and aperture without changing color balance. Built from imported optical glass with dual polishing and extensive coatings, it aims to protect image quality while reducing reflections and vignetting, making it a practical choice for 4K and 8K capture setups.

Key Features

• Matte box compatibility: Designed to fit standard matte boxes and filter frames so it can be used with Tilta, SmallRig or mini matte boxes for versatile rigs.
• 2-stop light reduction: The ND4 0.6 density reduces exposure by two stops, helping to control shutter speed and aperture in bright conditions without changing ISO.
• Imported HD optical glass: Double-sided polished glass keeps images sharp and avoids introducing a color cast, which is important for high-resolution 4K and 8K shooting.
• Ultra-low reflectivity: Reflectivity is controlled at 0.2% to minimize lens reflections and reduce the chance of unwanted flare and vignetting.
• 28 multi-layer coatings: Nanometer coatings on both sides make the filter scratch resistant, waterproof, oil proof and fingerprint resistant for easier field maintenance.

Who It's For

This filter is aimed at independent filmmakers, cinematographers, and camera operators who already use a matte box and need a compact, neutral solution for modest light reduction. It is particularly useful for run-and-gun 4K and 8K workflows where maintaining image clarity and color neutrality matters.

Those who should look elsewhere include still photographers who prefer circular screw-in filters for single-lens use and anyone needing heavy light reduction beyond two stops; this single-density square filter is not a full variable ND solution.

Pros & Cons

Pros

• Clean two-stop exposure control that helps balance aperture and shutter speed without color shift.
• High clarity from imported optical glass keeps fine detail intact for high-resolution video.
• Durable 28-layer coatings add scratch, oil and water resistance for field reliability.
• Low reflectivity reduces lens flare and vignetting for better contrast and color fidelity.

Cons

• As a square ND4, it must be mounted in a matte box and cannot be screwed directly onto a lens, limiting convenience for some shooters.
• Only a single density (2 stops) is provided, so users needing broader exposure control will need additional filters.

Specifications

Filter type	Square ND4 (0.6) neutral density
Dimensions	4 in x 5.65 in (10.16 x 14.35 cm)
Light reduction	2 stops (0.6 density)
Glass	Imported HD optical glass, double-sided polished
Coatings	28 multi-layer nanometer coatings (both sides)
Reflectivity	Approx. 0.2% ultra-low reflectivity
Mounting	Matte box / filter frame compatible (Tilta, SmallRig, mini matte box)

Our Verdict

The Square ND4 4in x 5.65in Matte Box ND Filter is a straightforward, well-made option for videographers who use a matte box and need a reliable two-stop reduction without compromising image clarity. Its optical glass and heavy coatings deliver low reflection and durable protection, making it a good value for 4K and 8K shooters who want consistent neutral density control as part of a matte box kit.

Frequently Asked Questions

Can this filter be screwed onto a lens?
No. This is a square matte box filter and must be used in a matte box or compatible filter frame rather than screwing directly onto a lens.

Will it change color or reduce sharpness?
Designed with imported optical glass and double-sided polishing, it is intended to maintain sharpness and avoid noticeable color cast for high-resolution video.

Is it weather resistant?
The 28 multi-layer coatings make the surface more resistant to scratches, water and oil, helping protect the filter during outdoor use.