Double-Convex Lenses

Material	BK7, FS, UVFS, CaF2, ZnSe, Si, Ge
Diameter Tolerance	+0.0, -0.15mm
Focal Length Tolerance	+-3%
Centration	<3 arc minutes
Clear Aperture	>90%
Chamfer	0,25mm@45deg
Surface Figure	λ/[email protected]
Surface Quality	40-20 scratch & dig
Design wavelength	632.8 nm
AR coatings	None. Please refer to the Coating Section

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Description Tables Metrology

Biconvex lenses are used as magnifiers, objectives, condensing systems. Since both surfaces contribute to the power of biconvex lenses, they have shorter focal length than PCX lenses of equal diameter and surface radius. Lenses can be anti-reflection coated (please refer to the Coatings section).

Properties (Diameter D, Focal length L)

D, mm	D, Inches	L Minimal, mm	L Maximal, mm
12,7	0.5	12	10.000
25,4	1	25	10.000
38,1	1.5	40	10.000
50,8	2	50	10.000
76,2	3	75	10.000

Altechna metrology lab applies following product inspection:

Visual inspection – surface quality evaluation according to MIL 13830 and ISO 10110 standards

Dimensions – measurement of geometrical dimensions, as diameter, thickness, etc.

Radius of Curvature (Spherometer)*

Effective Focal Length (Spherometer)

Centering (Centration unit)

Irregularity (Interferometer)

Wavefront distortion (Interferometer)

*(…) used equipment

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Diameter, mm	Edge Thickness, mm	Focal length, mm	Material	Product ID	Price	Action

12.7	2.0	+12	BK7	1-BCX-1-A127	28 €
25.4	2.0	+25	BK7	1-BCX-1-A254	32 €
12.7	2.0	+15	BK7	1-BCX-1-B127	28 €
25.4	2.0	+30	BK7	1-BCX-1-B254	32 €
12.7	2.0	+20	BK7	1-BCX-1-C127	28 €
25.4	2.0	+35	BK7	1-BCX-1-C254	32 €
25.4	2.0	+50	BK7	1-BCX-1-D254	30 €
12.7	2.0	+15	UVFS	1-BCX-2-A127	48 €
25.4	2.0	+30	UVFS	1-BCX-2-A254	58 €
12.7	2.0	+20	UVFS	1-BCX-2-B127	48 €
25.4	2.0	+40	UVFS	1-BCX-2-B254	58 €
12.7	2.0	+25	UVFS	1-BCX-2-C127	48 €
25.4	2.0	+50	UVFS	1-BCX-2-C254	58 €