Double Concave Lens

Specifications:

Material	BK7 glass, UV grade fused silica, CaF2
Diameter Tolerance	+0.0,-0.1mm
Center Thickness	+/-0.2mm
Bevle	<0.25mm
Paraxial Focal Length	+/-1% (EFL<1m) +/-2%（EFL>1m)
Surface Quality	60-40 scrath and dig
Clear Aperture	Central 85% of diameter
Coating	Uncoated, AR, HR, PR Coating, etc.

Standard Double Concave Lenses （BK7）

Part No.	f (mm)	dia (mm)	R1=R2 (mm)	t c (mm)	t e (mm)	t b (mm)
LDC1101	-25.0	12.7	26.25	2.0	3.6	-25.7
LDC1102	-30.0	12.7	31.44	2.0	3.3	-30.7
LDC1103	-40.0	12.7	41.80	2.0	3.0	-40.7
LDC1104	-50.0	12.7	52.17	2.0	2.8	-50.7
LDC1201	-25.0	25.4	26.25	2.0	8.6	-25.7
LDC1202	-35.0	25.4	36.62	2.0	6.5	-35.7
LDC1203	-50.0	25.4	52.17	2.0	5.1	-50.7
LDC1204	-75.0	25.4	78.09	2.0	4.1	-75.7
LDC1205	-100.0	25.4	104.00	2.0	3.6	-100.7