Name: Double Concave Lens
Brand: ECOPTIK(CHINA)LTD

Double Concave Lens

A double concave lens/mirror has a negative focal length, thereby causing collimated incident light to diverge. The double concave lens/mirror has an equal radius of curvature on both sides of the lens. They are generally used to expand light or increase focal length in the existing system, such as beam expander and projection systems.

Uses Double Concave Lens 

Description Of Double Concave Lens/Mirror

The double concave lens of Ecoptik China has a negative focal length, thereby causing collimated incident light to diverge. A double concave lens has an equal radius of curvature on both sides of the lens.

Specifications Of Double Concave Lens/Mirror

Material	Optical glass/ Fused silica/ sapphire etc.
Diameter	2mm~300mm
Diameter tolerance	±0.05mm(≤50mm)
Diameter tolerance	±0.1mm(＞50mm)
Focal length	-50mm~-2000mm
Focal length tolerance	±0.2%（＜10mm）
	±0.5%（＜10mm-1000mm）
	±1%（＜＞1000mm）
Center Thickness	2mm~20mm
Surface quality	60/40， 40/20， 20/10
Surface accuracy	λ/2~λ/10@632.8nm，532nm
Clear Aperture	>85% dig diameter
Centration	<3arc min~ 30arc sec
Coating	As per customer’s request

Material	Diameter (mm)	Surface Radius 1 (mm)	Surface Radius 2 (mm)	Center Thickness (mm)	Focal Length (mm)
H-ZK3	5	-14.4	-14.4	3	-9.8
H-ZF6	8	-7.2	-30.5	5	-7.4
H-K9L	10	-11.1	-11.1	2	-10.4
JGS1	10	-9.25	-9.25	1.25	-9.8
H-ZF7LA	11	-11.9	-11.9	2	-7.1
H-K9L	12	-25.1	-25.1	1.26	-24
BAF3	12	-19.5	-47.1	2	-23.4
ZF11	12	-12.6	-12.6	3	-7.4
H-K9L	12.5	-103	-103	1.5	-98.9
H-ZF6	13	-30.6	-154	3	-33.5
H-LAK7	13	-48.9	-27.7	2	-24.4
H-ZK2	13	-12.1	-15.7	1	-11.3
H-ZF6	13.5	-34.7	-79.6	1.5	-31.6
H-ZF2	14	-36.2	-192	3	-45
H-ZF6	14	-34.7	-79.6	3	-31.6
H-LAK53A	14	-31.7	-58.8	1.5	-27
H-K9L	14	-27.9	-32.2	2	-19
H-ZF6	15	-23	-27.7	2.8	-16.4
H-ZF6	15	-27.5	-23.6	7.23	-16.4
H-F3	15	-50.5	-11.3	1.5	-14.8
N-SF6	15	-13.2	-12.1	2	-7.4
H-ZF3	16	-30.6	-15.8	3	-14.6
H-LAF50B	16.7	-16.8	-17.8	1.8	-11
H-LAF50B	17.3	-37.2	-37.2	3	-23.9
H-K9L	20	-299	-85.4	2	-128
H-ZF52A	20	-51.6	-21	1.9	-16.7
H-ZF6	21	-77.4	-77.4	2.5	-51
H-ZF7LA	21	-42.6	-184	4.064	-42.8
H-ZF7LA	22	-255	-16.2	9	-18.7
H-K9L	24	-11.1	-90	1	-18.9
JGS1	25	-92.1	-92.1	2.5	-100
H-K9L	25	-52.1	-52.1	3.5	-50
H-LAF4	25	-38.4	-38.4	8.4	-25.4
H-F4	25	-36.7	-29.2	3	-25
ZK9	27	-149	-52.9	1.45	-62.7
H-ZK21	28.6	-281	-23.8	3	-35
BaK2	29.5	-2249	-80.2	2	-143
JGS1	30	-71	-71	3	-77
BaK2	30.5	-2249	-76.4	2	-137
H-ZF3	32	-11.8	-284	2	-15.7
ZF1	41	-692	-170	2.8	-211
ZF7L	44	-153	-49	3	-45.8
ZF4	54	-340	-249	2.5	-197
H-ZF3	58	-73.8	-234	4	-77.8
F4	60	-74.9	-78.4	1	-61.3
ZF1	65	-516	-163	5.49	-190
ZBaF3	65	-296	-52.4	2.5	-67.5
H-ZF2	68	-83.5	-249	5.5	-92.3
F13	68	-2465	-41.8	3	-65.6
H-F4	72	-170	-71.8	12	-80
H-K9L	90	-102	-347	6	-15 2

Classification and Applications of Optical Glass Assembly Lenses

The classification of optical glass lenses mainly focuses on application scenarios and optical characteristics, and their applications are highly matched with the demands of different fields for imagi...

2025.10

Content Analysis and Practical Application of ISO 10110

Preface and Standard BackgroundISO 10110 stands for "Optics and optical instruments - Preparation of drawings for optical elements and systems".Its purpose is to provide a unified, precise, ...

2025.10

Types and Applications of Optical Reticle Plates

A reticle is an auxiliary tool used for measuring and dividing optical instruments. It is usually made of transparent materials and has scales and markings to help people precisely adjust and calibrat...

2025.10

Double Concave Lens

Description Of Double Concave Lens/Mirror

Description Of Double Concave Lens/Mirror

Specifications Of Double Concave Lens/Mirror

Optical Spherical Lens Products