A high resolution thermal-neutron radiography facility has been designed and constructed at the 5-MW University of Missouri Research Reactor Facility. Neutrons leaving the core pass through 3 in. of beryllium, 13 in. of graphite, 4 in. of lead, and 8 in. of bismuth before entering the variable aperture of the conical collimator. This filtering produces a beam with a neutron-to-gamma-ray ratio >107 n/(cm1 mR). The variable aperture permits beam resolutions from 28:1 to 400:1 with neutron fluxes in the 13- × 13-in. exposure chamber from 8 × 107 to 4.7 × 105 n/(cm2 sec), respectively.