I am quite new to digital photography. I have just purchased a Canon 350D and I wonder if I can still use my old lenses (tele and zoom) by using a conversion ring to connect the M42 thread of the lenses to the Canon body. Is it at all possible? I realise I will lose the AF funtionality of the camera. Will any other function be lost, such as auto setting of aperture and speed by the camera? Can it in anyway damage the camera? Any advise will be greatly appreciated!