The Hasselblad 500 series, including the 503 is an all mechanical, precision camera made in that old world tradition of which few things are made today. It, along with the Twin Lens Rolleiflexes are the some of the oldest and best designed/made cameras still in production today. Actually, I think the TLR Rollei went out of production for a number of years during the 70's. The Hassy is one of the best used bargains going today and is a full system camera of which just about all bodies, backs, lenses and prisims for the past 40+ years are compatible. If you are patient, you can actually pick up a really nice 500CM or 501C complete with 80MM Planar lens and A12 back for between $500-$800 or so. If you want something a little cheaper, yet still reliable and capable of professional results, look no further than a simple Twin Lens Reflex Rolleicord 111 to V. It comes with either a Zeiss Tessar or Schneider Xenar 4 element lens of wonderful quality and can be had for betwen $100-$200. I use both the Hassys and the Rollei TLR and love them. No batteries required and just a joy to use.