• Ø1" Mounted Reflective (Metallic) ND Filters Available
• 10 Filters Included with Optical Densities from 0.1 - 4.0
• Mounted Versions are Housed in Labeled SM Threaded Lens Tubes
• Labeled Inserts Hold Filters Securely in Storage Box
• Inconel Coated Ø1" SM1 Mounted Filters
• NDK01 for 350 - 1100 nm Range

This Thorlabs' Reflective Neutral Density (ND) Filter Kit offers our most popular filters prepackaged in convenient metal storage boxes. The Ø1" Metallic ND Filters are mounted in SM1 series lens tubes. In all cases the housing is engraved with the optical density. Same-size lens tubes are stackable, making it possible to create an additive optical density effect. Each set of filters is housed in a metal storage box for convenient storage and transportation.

• Substrate: N-BK7
• Unmounted Diameter: 25.0 ± 0.5 mm (unmounted)
• Unmounted Thickness: 1.0 ± 0.25 mm (unmounted)
• Clear Aperture: 90% Diameter
• Flatness: <5λ over Diameter
• Surface Quality: 40-20
• Parallelism: <3 arcmin
• Damage Threshold (CW): 0.75 W/cm²