Prime focus corrector for the Lowell 4-m telescope

We describe a multi-element refractive corrector for the prime focus of the proposed Lowell four-meter telescope. The design provides sub-half arcsecond images over a two-degree field of view, with a flat image surface and images that are confocal across a broad wavelength band covering the U to I spectral range. Initial studies cover the feasibility of fabrication and explore the possibility of a simple atmospheric dispersion corrector.