The 30-120 is a Hastings Achromatic Triplet lens with a 15 mm diameter and a effective focal length (EFL) of 25.4mm. This lens is sourced from Edmund Optics and is available for purchase on their website. The lens is designed with a multiplet geometry, featuring an inner radius of 0 and an outer radius of 0. The lens's base shape is circular, and it has a thickness edge of 9.41mm.
The lens is composed of three elements made from N-F2 and N-BK7 Schott glass. The first and third elements are made of N-F2, while the second element is made of N-BK7. This configuration helps to correct chromatic aberration, making the lens suitable for use in a wide range of applications.
The lens is coated with Edmund Optics' standard MgF2 coating on both the front and back surfaces. This coating enhances the lens's performance in the 400-700nm spectral range, providing improved transmission and durability.
The lens's geometry includes a center thickness of 1.14mm, a thickness a of 10.21mm, and a thickness b of 1.14mm. The lens's r1 and r2 radii are 19mm and 9.3mm respectively, while the r3 and r4 radii are -9.3mm and -19mm respectively.