My daughter just informed me that she read I can get a back for my 500ELM and make it digital????? Are those backs expensive? Can you really turn an old 500CM or 500ELM into a digital camera? She also mentioned you can shoot single photos since one of the backs holds only one shot??? I am new to digtial and know nothing. I have put off buying digital cameras. But if I can simply put a back on my 500ELM and turn it into a digtial, I find that exciting. Has anyone any idea how much the least expensive back costs and what it is called?