(l-to-r)Olympus Ace and Ace E

Olympus Ace was designed on the smaller #00 size shutter.
Other makers used larger #0 size shutter to house fast lenses
and ended up with a heavy, complicated camera.
Olympus Ace E has a built-in serenium meter.

*

Interchangeable lenses for Olympus Ace/Ace E
(l-to-r)E.Zuiko-T 8cm F5.6 and E.Zuiko-W 3.5cmF2.8
Olymopus had a 8cmF4 tele lens but i'm yet to find one.