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Square glass filter, 75 by 85 mm, neutral dark finish

Urth

Urth 75x85mm Square ND16 4-Stop Lens Filter Plus+

SKU CH-9VZV-ET4G3

Square 75x85mm ND16 filter cuts four stops using German SCHOTT B270 glass with 20 nano-coating layers

  • 4-stop light reduction enables long exposures
  • German SCHOTT B270 glass prevents colour cast
  • 20 nano-coating layers resist water oil scratches
  • 75x85mm square fits standard filter holders
  • 2mm slim frame avoids vignetting

What the filter does

The Urth 75x85mm Square ND16 4-Stop Lens Filter Plus+ reduces incoming light by four f-stops using German SCHOTT B270 optical glass. It is built for photographers and videographers who need accurate colour rendition during long exposures or wide-aperture work in bright conditions. Twenty nano-coating layers resist water, oil and scratches while maintaining a consistent transmission curve. The 6.2 mm frame profile fits standard square filter holders.

Installing and common issues

Slide the filter into a compatible 75x85 mm square holder until it seats flush against the gasket. Clean the glass with a microfibre cloth before each use to avoid dust spots that become visible at small apertures. The nano-coating repels moisture, but salt spray or grit can still bind to the edges if not rinsed promptly. Over-tightening the holder screws may stress the glass corners.

Check before ordering

Confirm your filter holder accepts 75x85 mm squares and that the 6.2 mm thickness clears any internal ribs or lens hood adapters. Verify the lens front diameter and step-up rings match the holder system you own. Ensure you want a fixed four-stop reduction rather than a variable or stronger density for your typical shooting scenarios.

Highlights

  • 4-stop light reduction enables long exposures
  • German SCHOTT B270 glass prevents colour cast
  • 20 nano-coating layers resist water oil scratches
  • 75x85mm square fits standard filter holders
  • 2mm slim frame avoids vignetting

Specifications

No published specifications for this item yet.

Questions about this item

How can I confirm the filter is performing correctly after mounting it?

Check for neutral colour balance in test shots, verify that exposure requires four stops more light, and inspect the glass for any flare or ghosting under bright sources.

What comes in the box and what must I purchase separately?

The box contains the 75 x 85 mm square ND16 filter with 20 nano-coating layers; you will need a compatible square-filter holder and adapter rings for your lens thread size.

Should I choose the ND16 4-stop version or a different density?

Select the ND16 when you need a fixed 4-stop reduction for long exposures or wide apertures in moderately bright conditions; choose a higher or lower density only if the lighting demands more or less attenuation.

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