robustness is an issue, that the nex 7 is lacking in. not only the display errors and rubber problems take me to handle my nex with extreme care, what is sometimes quite annoying. quite different to the even smaller, lightweight and robust diana mini: i don't shy away from lying it on the concrete floor or scratching it across the street.
on the other hand error robustness while handling the diana mini is ... ambivalent. actually its operation is pretty easy: you may choose from four focus distances, two aperture settings (cloudy | f8.0 and sunny | f11.0) and two different shutter speed options (normal | 1/60 and bulb), but sometimes due to the lack of control indicators in the direct focus one forgets to set the correct values...
be that as it may, i love the two to three seconds bulb exposure of the skating marv.