Achromatic lenses(doublets)is a lenses consisting of two cemented elements made of different materials, usually flint glass with crown glass. The achromat offers superior correction of spherical aberration in monochromatic applications. In addition to higher image quality, additional advantages of the cemented achromat include: simplified mounting since it becomes one unit, smaller light loss resulted from fewer surfaces, less stray light due to reduced reflections.

Specifications: Material: grade A optical glass or Fused Silica Design Wavelength: 480.0nm, 546.1nm, 643.8nm Diameter: Smallest up to 2mm Diameter Tolerance:+0.0, -0.10mm Paraxial Focal Length: ±2% @546.1nm Centration: 3 arc minutes Clear Aperture: >80% Surface Figure: lambda/4@632.8nm Surface Quality: 60-40 scratch and dig Coating: Single layer MgF2 broadband AR coating Protective Bevel