Long pass filter allow the longer wavelength throught, and cut off the shorter wavelength.These filter mainly used in Beauty equipment, police multiband testing instruments, strong light flashlight, stage lighting shade, four-wheel, iris recognition system, face recognition attendance device, optical instruments. Diameter:2mm to 200mm Diameter Tolerance:+0.00/-0.1 or customer size Material:N-BK7,H-K9L,Sapphire,Fused Silica(JGS1),Caf2,ZnSe,Si,Ge,etc. Surface Quality:80-50 to 10/5. Flatness :1/4 LAMNDA Thickness Tolerance:+0.00/-0.05mm Standard wavelength 270nm,311 360 380 473 532 650 780 808 850 904 940 1064 and 1900nm. Transmission:7.511m: Tavg 90%, Tmin 80% 1.5.m: Tmax 3% Transmission:60% to 99% Average blocking 0.1%,0.01%,0.001%.0.001DFYT
