Edmund Optics is expanding its selection of TechSpec MgF2-coated achromatic lenses. Consisting of two optical components cemented together to form an achromatic doublet, the lenses include fast achromatic types and micro achromats. They are computer-optimized to correct for on-axis spherical and chromatic aberrations and offer a variety of optical solutions for polychromatic illumination and imaging needs. Fast achromatic lenses allow for maximum light collection and are designed to produce a small, focused spot size and high-quality images without decreasing the clear aperture, and they offer improved chromatic focal shift. Featuring f/1 designs, they have been designed to minimize chromatic and spherical aberration for good focused spots at short working distances. They are available with a single-layer MgF2 coating in diameters ranging from 9 to 25 mm. Other designs and coating options also are available. They are suitable for use in laser focusing applications.