The Mamiya Sekor CS 2.8/28mm is an extremely small and lightweight 2.8/28mm lens. In addition its barrel is well made (full metal construction), and its optical construction is quite complex: eight lenses in seven groups. Its optical performance is on par with the larger and better known 2.8/28mm lenses from e. g. Canon, Minolta and Nikon. 

 

 

 

Mamiya CS 28mm f28 lens section

 

Mamiya CS 28mmf28
 

 MAMIYA SEKOR CS 28mm 1:2.8                 
(8 Linsen / 7 Glieder)