The Mamyia Sekor E 3.5-4.5/28-50mm is a surprisingly small wide- to normal zoom lens for the Z series SLRs (ZE, ZE-2, ZE-X and ZM). It's barrel is made from metal, and it feels pretty solid and sturdy. Focusing and zooming is done by one one ring. Its minimal focusing distance (MFD) is 0.6m, and it doesn't have any macro mode.

Its optical construction - nine lenses in eight elements - is similar to the classical two-group 35-70mm zooms, and its optical performance is as good or even better than most contemporary 28-85mm zooms. The lens clearly is optimized for the 28mm and 35mm range; at f=50mm its performance is a bit lower and not on par with contemporary primes. At the shorter end, though, and especially stopped down, it is pretty usable even on 24MP full frame cameras.

25-50mm (-55mm) lenses are pretty scarce, and the Mamiya 28-50mm is a bit difficult to find.

MAMIYA SEKOR E 28-50mm 1:3.5-4.5                  (9 lenses / 8 elements)