Gradient Filters

Round, black and white, metal disc.

Versatile Gradient Filters for UV to Far Infrared Wavelength

Notch Optics specializes in manufacturing continuously variable filters that allow for customized density or patterns across the substrate. These filters are available in various configurations, including Linear Apodizing, Circular Variable Neutral Density, Circular Variable Neutral Transmission, Linear Variable Neutral Density, and Linear Variable Neutral Transmission.


Continuously variable gradient filters are optical filters with adjustable light transmission designed to function from UV to far infrared wavelengths. They can be produced in sizes ranging from a few millimeters to over 250 mm in diameter or square, with optical densities typically ranging from 0 to 1, 2, 3, 4, or 5.


Notch Optics offers customization of sizes and densities upon request, from custom prototypes to volume production.

General Gradient Filter Specifications

Gradient Types:Linear Apodizing, Circular Variable ND & Linear Variable ND
Sizes:12.5 mm - 250 mm
Optical Density Range:Specify: 0 to 1, 2, 3, 4, or 5
Transmission Range:Clear (92%) to 1% or 10%
Substrate Materials:N-BK7, Fused Silica & ZnSe
Coating Types:Dielectric & Metallic
Three graduated neutral density filters.
Orange-yellow gradient square filter.

Custom Variable Filters

Discover the power of precision and versatility with Notch Optics' continuously variable filters. Get in touch now to customize your optical filters!

Visual Overview of Optical Filters