Each unit telescope is comprised of: a 1" thick, 30" diameter spherical primary mirror on a support with tip-tilt actuators for alignment and focus; a refractive prime focus corrector (PFC) that corrects spherical aberration over an 8 arcmin field; a fiber at prime focus that. Each unit telescope is comprised of: a 1" thick, 30" diameter spherical primary mirror on a support with tip-tilt actuators for alignment and focus; a refractive prime focus corrector (PFC) that corrects spherical aberration over an 8 arcmin field; a fiber at prime focus that. light from thousands of small telescopes at centrally located high-resolution spectrometers. LFAST aims to use mass replication of small, self-contained telescope systems to pro ide ELT sized collecting area and spectroscopic capabilities at a drastically reduced price. However, fundamental. The concept for the Large Fiber Array Spectroscopic Telescope (LFAST) (Angel et al, these proceedings) is to collect the light from a target object using thousands of individual, small, low-cost telescopes, and bring it via optical fibers to a high resolution (R=150,000) spectrograph. We present the throughput budget of our first prototype unit across 400–1700 nm, in which we examine the optical train from the 0.