• Ø1/2" Filter in an SM05-Threaded Mount
• Mount Engraved with Part Number and Optical Density
• Ideal for Low-Power Applications (<1 Watt)
• Surface Flatness: λ/10 (@ 633 nm)
• Absorptive Glass Reduces Multiple Reflections

This Mounted Absorptive Neutral Density (ND) Filter has a diameter of 1/2" (12.7 mm) and the mount is SM05 (0.535” -40) threaded and is also engraved with both the part number and the optical density. These mounts are compatible with a wide range to rigid construction optomechanical parts such as our cage systems and other lens tubes.

Please note that this product is not designed for use as laser safety equipment. For lab safety, Thorlabs offers an extensive line of safety and blackout products, including beam blocks, that significantly reduce exposure to stray light.

• Diameter Tolerance: +0.0/-0.25
• Clear Aperture: 90% Outer Diameter
• Surface Flatness (@633 nm): λ/10
• Surface Quality: 40-20 Scratch-Dig
• Parallelism: 3 arcmin
• Optical Density (@ 633 mm): 3.0 ± 0.15
• Theoretical Transmission (@ 633 mm): 0.1%
• Substrate Thickness: 2.11 mm
• Substrate: NG9