redscale

I have this Smena 8M with a collapsed lenses so I keep the lens from a disposable camera and I put it in the Smena lens housing, the new lens give an aprox 28mm focal lenght with a fix f16 aperture and a focus free (40cm to infinite) this is a great improvement compared to the original Smena 43mm and you don't have to care abot focusing or aperture but only about exposure time (still working)! but something went wrong, only 4 shots are on the film at the end, I don't know what's wrong, I've used a 12 exposure Agfa Portrait 160 iso, maybe I've used wrong exp. time...who know?