The asymmetry of plano-convex lenses between the front and back surface minimizes spherical aberration effectively, particularly in the situations where the object and image are not at equal distance from the lens. The optimum case is where the object is placed at infinity (regarded as parallel rays entering lens) and the image is on the focus, which has infinite conjugate ratio, i.e. object distance/image distance. The curved surface of the lens should face the object direction.

Material:                                   BK7 grade A, fine annealed
• Focal Length (f'):                      ±2%@587.6nm
• Diameter(φ) Tolerance:             +0.0/-0.20
• Center Thickness (Tc):               ±0.1
• Centration:                                3’
• Form Error:                                1 ? 5 fringes
• Irregularity of Fringes:               0.2 ? 0.5 fringes
• Surface Quality:                        60-40 scratch-dig
• Coating:                                    GCL-0101xx: 1/4 wave MgF2 coating at 550nm for 0°angle of incidence
                                                   GCL-0101xxA: VIS Multiple Layers AR coating, Rave≤0.5%@450-800nm
                                                   GCL-0101xxB: NIR Multiple Layers AR coating, Rave≤0.5%@800-1100nm
• Clear Aperture:                         90% diameter

Specifications