Four (4) original large-format vintage gelatin silver prints on matte paper from NASA's Second Lunar Orbiter mission, launch date November 6, 1966, to search for potential landing spots for the upcoming Apollo missions. The photographs are designated II-64H2, II-92M, II-138M, II-149H1. Image 64H2 is a high-resolution image of the area directly east of the crater Ariadaeus B, south of Rima Ariadaeus. Image 92M features the intersection of multiple rilles directly to the East of Triesnecker crater in the Sinus Medii region. Image 138M is an area near Gambart crater. Image 149H1 covers a small crater-strewn area of the Mare Insularum, west of Reinhold crater and north/northeast of Lansberg crater. A total of 215 sets of photographs were planned for the second orbiter mission in 1966, each consisting of one medium-resolution image and three high-resolution images of the same area. Unframed. Sheets measure 24" H x 20" W. Note: "Five Lunar Orbiter missions were launched in 1966 through 1967 with the purpose of mapping the lunar surface before the Apollo landings. All five missions were successful, and 99% of the Moon was photographed with a resolution of 60 m or better. The first three missions were dedicated to imaging 20 potential lunar landing sites, selected based on Earth-based observations. The Lunar Orbiters had an ingenious imaging system, which consisted of a dual-lens camera, a film processing unit, a readout scanner, and a film handling apparatus. Both lenses, a 610-mm narrow angle high-resolution (H) lens and an 80-mm wide-angle medium resolution (M) lens, placed their frame exposures on a single roll of 70 mm film. The axes of the two cameras were coincident so the area imaged in the HR frames were centered within the Medium Resolution frame areas. The film was moved during exposure to compensate for the spacecraft velocity, which was estimated by an electric-optical sensor. The film was then processed, scanned, and the images transmitted back to Earth. Launch: 6 November 1966
Imaged Moon: 18-25 November 1966 Lunar Orbiter 2’s mission was to photograph 13 primary and 17 secondary landing sites for the Apollo program in the northern region of the Moon’s near side equatorial area." (Source: NASA.gov)

Each in very good condition with slight wrinkling, predominately on edges, a few corners with handling creases. 

Private Knoxville collection. Consignor previously worked in the planetary science field in Houston, TX.