I would avoid the Minolta SR/SRT series. These cameras use a fragile thread to connect the aperture ring to the cameras built in meter. The thread passes over several pulleys. Should it break the camera is useless and repair costs more than the camera. I was given one and was shocked by this poor design.[/QUOTE]
Many cameras do use pulleys and thread. In fact the Nikon FM uses pulley and thread to set the shutter speed. However, if the meter on the SRT goes dead it's small lost as I have used serveral SRT and although the meters are ok I never use the meter. Just estimate the exposure, Worked very well.