150mm f/5.6 EL-Nikkor Enlarging Lens - For many years, El-Nikkor lenses have been the most widely used enlarging lenses available. Moderately priced, multi-coated and superbly sharp, they are found in every kind of darkroom from the home user to professional labs. A full range of lenses is available from 40 to 360mm.
Note:
Jam Nut Required with Some Enlargers.
Standard lens for the 4x5" format
Optimum enlargement size is 16x20"