Video with Peter Karbe on how Leica designs and builds its Leica SL lenses
This video with Peter Karbe of Leica has many interesting insights into how Leica designs and builds its Leica SL lenses. For example, sustantial effort went into quality control and “desensitization” of the spacing of lens groups. Also, the claim is that real lenses have MTF very close to the computed-from-model MTF.