The E-400 is notable for its small size, omitting the hand grip and exploiting the smaller sensor. It weighs only 375g and approaches manual focus film SLRs sizes, reminiscent of the Olympus OM system.
The E-400 is described as being compact and lightweight, similar in size to older manual focus film SLR cameras like those from the Olympus OM system. It achieves this by omitting a handgrip and utilizing a smaller sensor.