BK-7 Biconvex Lenses

An extensive range of symmetrically convex positive lenses Standard focal lengths from 3 to 300mm Standard diameters from 3 to 100mm Complete range of optional antireflection coatings Also available in Fused Silica These symmetrical biconvex lenses are best when used at finite conjugates. They are ideal for 1:1 imaging or for use in multi-element systems.

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Specifications & Tolerances
Focal length:	±1%
Thickness:	±0.1mm
Surface quality:	20-10
Material:	BK7 grade A
Diameter:	+0, -0.1mm
Centration:	<1arcmin
Aperture:	>90%
Coating:	Optional broadband AR 400-700nm (for other wavelengths see coatings section)

Biconvex Lenses
BK-7 Biconvex Lenses					UNCOATED		COATED 400-700nm BMAR
Diameter, D (mm)	Focal Length (mm)	Thickness		Availability	Price	PRODUCT NUMBER	Price	PRODUCT NUMBER
		Center,tc (mm)	Edge,te (mm)
3.0 (SK2)	3.0	1.8	1.1	from stock		013-0010		013-0010-A55
3.0	4.0	1.8	1.2	from stock		013-0020		013-0020-A55
3.0	6.0	1.5	1.1	from stock		013-0030		013-0030-A55
4.0 (SK2)	4.0	2.2	1.2	from stock		013-0060		013-0060-A55
4.0	6.0	1.9	1.2	from stock		013-0070		013-0070-A55
-	-	-	-	-		-		-
4.0	8.0	1.7	1.2	from stock		013-0080		013-0080-A55
5.0	6.4	2.5	1.5	from stock		013-0120		013-0120-A55
5.0	8.4	2.2	1.4	from stock		013-0130		013-0130-A55
5.0	10.3	1.9	1.3	from stock		013-0140		013-0140-A55
5.0	12.3	1.7	1.2	from stock		013-0160		013-0160-A55
-	-	-	-	-		-		-
6.0	6.4	2.5	1.0	from stock		013-0230		013-0230-A55
6.0	8.4	2.1	1.0	from stock		013-0240		013-0240-A55
6.0	10.3	1.9	1.0	from stock		013-0260		013-0260-A55
6.0	12.3	1.7	1.0	from stock		013-0270		013-0270-A55
8.0	8.6	3.6	1.5	from stock		013-0550		013-0550-A55

BK-7 Biconvex Lenses (Continued)					UNCOATED		COATED 400-700nm BMAR
Diameter, D (mm)	Focal Length (mm)	Thickness		Availability	Price	PRODUCT NUMBER	Price	PRODUCT NUMBER
		Center,tc (mm)	Edge,te (mm)
7.0	8.6	3.5	2.0	2 weeks		013-0410		013-0410-A55
7.0	10.5	3.1	1.9	2 weeks		013-0420		013-0410-A55
7.0	12.5	2.8	1.8	2 weeks		013-0430		013-0430-A55
7.0	15.4	2.5	1.7	2 weeks		013-0440		013-0440-A55
7.0	20.4	2.3	1.7	2 weeks		013-0450		013-0450-A55
-	-	-	-	-		-		-
8.0	10.5	3.1	1.5	from stock		013-0560		013-0560-A55
8.0	12.5	2.8	1.5	from stock		013-0570		013-0570-A55
8.0	15.4	2.5	1.5	from stock		013-0580		013-0580-A55
8.0	20.4	2.3	1.5	from stock		013-0590		013-0590-A55
8.0	25.4	2.1	1.5	from stock		013-0660		013-0660-A55
-	-	-	-	-		-		-
10.0	10.8	4.6	2.0	from stock		013-0770		013-0770-A55
10.0	15.6	3.6	2.0	from stock		013-0780		013-0780-A55
10.0	20.5	3.2	2.0	from stock		013-0790		013-0790-A55
10.0	25.5	3.0	2.0	from stock		013-0880		013-0880-A55
10.0	30.5	2.8	2.0	from stock		013-0890		013-0890-A55
-	-	-	-	-		-		-
10.0	40.4	2.6	2.0	from stock		013-0990		013-0990-A55
10.0	50.4	2.5	2.0	from stock		013-1110		013-1110-A55
10.0	60.4	2.4	2.0	from stock		013-1120		013-1120-A55
12.7	13.0	5.5	2.0	from stock		013-1160		013-1160-A55
12.7	20.7	4.0	2.0	from stock		013-1170		013-1170-A55
-	-	-	-	-		-		-
12.7	25.6	3.6	2.0	from stock		013-1180		013-1180-A55
12.7	30.6	3.3	2.0	from stock		013-1185		013-1185-A55
12.7	40.5	3.0	2.0	from stock		013-1190		013-1190-A55
12.7	50.5	2.8	2.0	from stock		013-1220		013-1220-A55
15.0	16.0	5.9	2.0	from stock		013-1250		013-1250-A55
-	-	-	-	-		-		-
15.0	20.8	4.8	2.0	from stock		013-1260		013-1260-A55
15.0	25.7	4.2	2.0	from stock		013-1270		013-1270-A55
15.0	30.6	3.8	2.0	from stock