Metallic ND Filter, UV Fused Silica, 50.8x50.8 mm, 0.9 OD at 632.8 nm

50.8 x 50.8 mm

200 - 1800 nm

0.9

±4% @ 632.8 nm

12.6% @ 632.8 nm

0°

UV grade fused silica or equivalent

30 W/cm² CW, typical; not recommended for pulsed laser use

3.0 mm

±0.25 mm

≤2λ at 632.8 nm over the clear aperture

60-40 scratch-dig

≥central 80% of dimensions

≤3 arc min

0.25–0.76 mm face width

45° ±15°

MIL-C-48497A, adhesion, humidity, moderate abrasion, and solubility requirements

See How to Clean Optics