Offers a guide to the benefits of aspherical lens elements, which offer lighter and smaller lens construction.

Defines terms and aspects of camera lenses and provides a lens tutorial.

Offers detailed technical data relating to a series of tests of the Olympus OM system lens.

Features technical information about a large collection of Pentax 67 lenses.

Find a lengthy lesson in the use of lenses perhaps best suited for intermediate or advanced photographers.

Shares lens test data for medium and large format photography. Gives advice on determining meaningful resolution limits.

Conveys the results of a test of six different Pentax camera lenses.

Marco Antonetto's book on the history of Topcon Optical can be ordered by collectors. Index of the company history, sale items, and resources.