Ektra Ektars
These lenses are entirely new in design. All corrections have been carried out to the high degree so essential for fine photography and especially important for precision miniature work. Particular attention has been given to lateral and longitudinal color corrections. Inner air-glass surfaces are coated to reduce reflections, thereby improving shadow details and billiancy in black-and-white negatives and color purity in Kodachrome transparencies. Newly designed precision mounts assure premanent accuracy as well as ease in manipulation. Each lens has an integral depth of field indicator and a focusing mark for infrared film. All lenses are readily interchangeable on the Kodak Ektra, have accurate positioning with respect to the focal plane and to automatic coordination with the range finder and parallax correction in the view finder.

KODAK EKTAR f /4.5, 153mm., yields a 15% larger image than a 135mm lens.

Kodak Reference Manual/Lens, Rangefinders and Shutters section,
© 1942, 1945