Overview: Double-Convex (DCX) Lens, also referred to as bi-convex lens, has two positive, symmetrical faces with equal radii on both sides. These lenses are generally recommended for finite imaging applications. Bi-convex lenses are most suitable where the object and image are on opposite sides of the lens and the ratio of the image and object distances (conjugate ratio) is between 0.2 and 5. Star Optic provides double-convex lenses in a variety of substrates and anti-reflection coating options.  General Specifications Of N-BK7 Double Convex (DCX) Spherical Lens: Material | N-BK7, UV FS, N-SF11, CaF2, Si, Ge, ZnSe, Sapphire |  | Design Wavelength | 546.1nm | Surface Flatness | N<3(0.5)@632.8nm | Surface Quality | 60/40 scratch-Dig | Diameter Tolerance | +0/-0.2mm | Thickness Tolerance | ±0.2mm | Centration | <3 arc minutes | Focal Length Tolerance | ±2% | Clear Aperture | >90% | Chamfer | Protective<0.5mmx45° | Standard ProductsOf N-BK7 Double Convex (DCX) Spherical Lens: Part No. | Material | D (mm) | f (mm) | R1 (mm) | R2 (mm) | Tc (mm) | Te (mm) | DCXD12F25 | N-BK7 | 12.7 | 25.4 | 25.98 | 25.98 | 3.6 | 2 | DCXD12F35 | N-BK7 | 12.7 | 35 | 35.74 | 35.74 | 3.1 | 2 | DCXD12F50 | N-BK7 | 12.7 | 50 | 51.35 | 51.35 | 2.8 | 2 | DCXD12F75 | N-BK7 | 12.7 | 75 | 77.31 | 77.31 | 2.5 | 2 | DCXD12F100 | N-BK7 | 12.7 | 100 | 103.25 | 103.25 | 2.4 | 2 | DCXD12F125 | N-BK7 | 12.7 | 125 | 129.18 | 129.18 | 2.3 | 2 | DCXD12F150 | N-BK7 | 12.7 | 150 | 155.1 | 155.1 | 2.3 | 2 | DCXD12F200 | N-BK7 | 12.7 | 200 | 206.94 | 206.94 | 2.2 | 2 | DCXD12F250 | N-BK7 | 12.7 | 250 | 258.78 | 258.78 | 2.2 | 2 | DCXD12F300 | N-BK7 | 12.7 | 300 | 310.61 | 310.61 | 2.1 | 2 | DCXD12F500 | N-BK7 | 12.7 | 500 | 517.94 | 517.94 | 2.1 | 2 | DCXD12F1000 | N-BK7 | 12.7 | 1000 | 1036.23 | 1036.23 | 2.1 | 2 | DCXD25F25 | N-BK7 | 25.4 | 25.4 | 24.68 | 24.68 | 9 | 2 | DCXD25F35 | N-BK7 | 25.4 | 35 | 35.08 | 35.08 | 6.8 | 2 | DCXD25F50 | N-BK7 | 25.4 | 50 | 50.92 | 50.92 | 5.2 | 2 | DCXD25F75 | N-BK7 | 25.4 | 75 | 77.04 | 77.04 | 4.1 | 2 | DCXD25F100 | N-BK7 | 25.4 | 100 | 103.05 | 103.05 | 3.6 | 2 | DCXD25F125 | N-BK7 | 25.4 | 125 | 129.02 | 129.02 | 3.3 | 2 | DCXD25F150 | N-BK7 | 25.4 | 150 | 154.97 | 154.97 | 3 | 2 | DCXD25F200 | N-BK7 | 25.4 | 200 | 206.84 | 206.84 | 2.8 | 2 | DCXD25F250 | N-BK7 | 25.4 | 250 | 258.7 | 258.7 | 2.6 | 2 | DCXD25F300 | N-BK7 | 25.4 | 300 | 310.54 | 310.54 | 2.5 | 2 | DCXD25F500 | N-BK7 | 25.4 | 500 | 517.9 | 517.9 | 2.3 | 2 | DCXD25F1000 | N-BK7 | 25.4 | 1000 | 1036.21 | 1036.21 | 2.2 | 2 | Coating Options Of N-BK7 Double Convex (DCX) Spherical Lens: Star Optic's above standard double convex spherical lenses are uncoated. In order to reduce the amount of light reflected from each surface of the lens, antireflection coatings including singer layer MgF2, multi-layer AR coating, Broadband multi-layer AR coating and Dual wavelength AR coating are also available. Single Layer MgF2 Coating | Multi-layer Anti-Reflective Coating |  |  | Boradband Anti-Reflective Coating | Dual Wavelength Anti-Reflective Coating |  |  | Mounting Options For Double Convex (DCX) Spherical Lens: Star Optic's above standard double convex spherical lenses are not mounted. However, we can provide fixed mount and adjustable mount for our lenses. Fixed Lens Mount  |  | Adjustable Lens Mount  |  | Custom Your Own Lens: You have your full design freedom, and we are able to work with complex designs to get you exactly what you need including optical design, mechanical design and optical coating design. Zemax Deisgn  | Zemax Deisgn  | Solidworks Design  | Thin Film Coating Design  | |