I am trying to do some pictorial microphotography, in other words pictures with a microscope which look pretty rather than serve a strict scientific purpose. To this end, I ideally want to fill a 35 mm frame with the microscope image - my first attempt with my Meopta microscope, a camera adapter and a 50 mm macro lens produced circular images about 20 mm across. My initial thought was to use a 135 mm lens - there is no need for the lens to be a macro type, since it will be working at infinity focus. Does anyone have experience of this - is the 135 mm lens the only possibility, or is there another and perhaps better way of getting full-frame images? All ideas welcome!