Band-pass filters is a kind of narrow bandwidth glass, and short wavelength, long wavelength in cutting,，as the photo：
and their spectrum character is for (TM) and (λM) , half bandwidth.

No	Model	Bandwidth	Short-cutting截止	Long-cutting	Half-bandwidth	Thickness
No	Model	(TM/λMnm)	(T/λnm)	(T/λnm)	(λ2-λ1)(nm)	(mm)
1	DBT400	≥45/400±2	0/320±5	0/525±5	≤90	2
2	DBT435	≥48/435±2	0/340±5	≤2.0/540±5	≤100	4
3	DBT470	≥40/470±2	0/340±5	0/600±5	≤115	4
4	DBT500	≥48/500±2	0/380±5	0/630±5	≤100	4
5	DBT530	≥48/530±2	0/420±5	0/670±5	≤95	2
6	DBT545	≥48/545±2	0/400±5	0/720±5	≤100	4
7	DBT560	≥40/560±2	0/435±5	0/725±5	≤104	4
8	DBT600	≥36/600±2	0/470±5	≤1.0/800±5	≤95	4
9	DBT660	≥44/660±2	0/500±5	≤2.0/800±5	≤115	4
10	DBT700	≥28/700±2	≤0.5/570±5	≤2.0/820±5	≤95	4
11	DBT720	≥50/720±2	0/500±5	≤9.0/900±5	≤140	4
12	DBT740	≥25/740±2	0/650±5	≤4.0/900±5	≤85	4