The 47-733 is a high-quality achromatic doublet lens, sourced from Edmund Optics, featuring a 20 mm diameter and an effective focal length (EFL) of 30 mm. This lens is specifically designed for the visible spectrum, covering a wavelength range of 425-675 nm.
The lens is constructed from two types of glass: S-BAH11 from Ohara and N-SF10 from Schott. The S-BAH11 glass is used for the first element, while the N-SF10 glass is used for the second element. This combination helps to correct chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points.
The lens features a standard anti-reflection coating on both the front and back surfaces, specifically the EDM VIS-0 std curve coating. This coating helps to reduce surface reflections, improving light transmission through the lens.
The lens geometry includes a central thickness of 8.4 mm, with an edge thickness of 7.21 mm. The lens has a concave-convex-concave shape, with radii of curvature of 21.41 mm, -13.75 mm, and -105.58 mm for the first, second, and third surfaces, respectively. There is also a minor asymmetry in the lens design, with a thickness of 1.76 mm at the center of the first surface.