An blocking filter is an optical element that in a defined spectral region blocks the light completely while transmitting it in a closely adjacent

region with high transparency. If the transmission region lies in the longer-wave region compared with the rejection region, the filters are

called long-wave pass or cut-on filters. In the inverse case, the filters are shortwave pass or cut-off filters.

long pass filter:

lp380,lp415,lp440,lp450,lp470,lp490,lp510,lp520,lp530,lp540,lp550,lp570,lp590,lp610,lp620,lp640,lp670,lp700,

lp710,lp730,lp750,lp780,lp800 ....

short pass filter:

sp430,sp450,sp470,sp490,sp510,sp530,sp550,sp570,sp590,sp610,sp650,sp700,sp730,sp760,sp800....