If the photos were from 1971, he was NOT using a digital camera..
so digitizing from film, the scanner and software used to convert the film negative or positive to digital format is the key to the quality of the digital images... (For very high resolution on the film, he was likely using a 2-1/4x2-1/4 - ie. 70 mm film format, but even a 35 mm film will yield very nice digital images if a high quality digitizer and software are used).