Size: ..........................................................φ50 x 2mm (ID:φ7.5) Tolerance: OD:.........................................................+0/-0.25mm ID: .........................................................+0.25/-0mm Thk: ...........................................................±0.25mm Coating Radial Angle: ..........................................................±1º Spectral Range: .......................................................380-1200nm Coating: ...........................................................ND at Front Face Flatness: ..............................................................λ/2@632.8nm S/D: ................................................................................60-40 Wedge: .....................................................................<3 arc min. Optical Density Tolerance:..........................±5% (At Both Extremes) Linearity of Density: ..........................................................±5% Chamfer: .................................................................0.2 x 0.2mm Gradient Direction: .............................................Counterclockwise