1. An apparatus, comprising: a receptacle for holding a stack of sheet media; an image sensor operable to generate image data in response to light received from a view encompassing edges of ones of the sheet media held in the receptacle; a sheet media edge detector operable to detect edges of individual ones of the sheet media in the image data generated by the image sensor; a housing, comprising: a rendering engine operable to mark the sheet media; the image sensor; the receptacle; and a sheet media feeder operable to extract seriatim individual sheet media from the receptacle; and an optical element operable to direct light from the view to the image sensor; wherein the receptacle is movable within the housing, and further comprising a cleaner attached to the receptacle operable to wipe a surface of the optical element in response to movement of the receptacle within the housing.