Achromatic doublet lenses have significantly better optical performance than singlet lenses in visible imaging and laser beam manipulation applications. Our achromats are computer designed to effectively minimize spherical aberration and coma when operating at infinite conjugate ratio. Unlike singlet lenses, this results in a constant focal length independent of aperture and far better off-axis performance. Freedom from spherical aberration and coma means that achromats are superior to singlet lenses for monochromatic applications at any visible wavelength.At 1064 nm, the focal length of a typical achromat increases by approximately 0.75%. An achromat will not be diffraction limited at 1064 nm but performance will still be superior to a singlet lens. For image relay and optical processing applications, a specially designed symmetric achromatic triplet lens optimized for 1:1 conjugate ratio is available ( PAC076 ). This lens is diffraction limited at 488, 514.5, and 632.8 nm.All of our precision achromats are available with a multi-layer (AR.14) or single-layer (MgF2) broadband antireflection coating to increase transmission throughout the visible spectrum.Standard diameters from 6.35 mm to 76.2 mm enable mounting in many Newport holders when building laboratory experiments. Our achromats can be substituted for our singlet lenses, allowing complex experiments to be verified with simple lenses and later improved with achromats.