Leica has two new SummicronSL lenses with identical focal lengths 35mm and 50mm to two other SL lenses in the lineup. These older lenses are an Apochromatic design, the new ones are not. Nick Rains looks at the features and benefits of these new lenses and explains the differences.

Addendum: I show the APOSummicronM 50mm but not the results. They are, to all intents and purposes, identical to the results from the APOSummicronSL 50mm. I did say this verbally, but it got missed out in the edit.