Metrogon
Videos
Metrogon is a high resolution, low-distortion, extra-wide field photographic lens design, popularized by Bausch and Lomb. Variations of this design were used extensively by the US military for aerial
Fairchild K-17C aerial camera with Metrogon lens
Topogon
Videos
Topogon is a wide field, symmetrical photographic lens patented by Robert Richter in 1933 for Carl Zeiss AG. As there are four meniscus elements in four groups, deployed symmetrically around the centr
Topogon-design lens and auxiliary viewfinder for the Mamiya Press line of cameras