Wakimoto Zenji (脇本善司) was a famous Japanese lens designer. In the 1950s and 1960s he worked for Nikon where he won fame for the ultra-sharp Micro Nikkor 5cm f3.5 lens for microfilm cameras. In 1954 he created the Nikkor P.C. 10.5cm f/2.5, the fastest ~100mm lens of its time. He also developed he Nikkor-S 50mm f1.4 lens which was introduced in 1962.
- The name is given in the Japanese order, with family name followed by the given name.