双凸透镜在许多有限成像应用中很受欢迎。双凸透镜最适用于物象相对于透镜两侧,物象距离比(共轭比)在0.2 ~ 5之间的情况。
双凸透镜在透镜的两侧具有相同的曲率半径,其作用类似于平凸透镜,通过将平行光线聚焦到一个点上。作为指导方针,双凸透镜执行最小像差在5:1和1:5之间的共轭比。
| Material | optical glass,N-BK7 , Fused Silica, sapphire,Si,Ge,CaF2,LiF,BaF2,Znse,ZnS |
| Dimensions | 3-400mm |
| Dimension Tolerance | ±0.01mm |
| Thickness Tolerance | ±0.01mm |
| Center thickness | >1mm |
| Focal Length tol. | ±1% |
| Centration | 3 arc minutes |
| Surface Quality | 80/50 60/40 40-20 20-10 |
| Clear Aperture | >90% |
| Bevel | Protective bevel as needed |