Thanks chio for your ample comment!
I know that all camera have similarities but their technologies are different, other lens fabricants, electronique properties... I think the secret is between ISO, shutter speed, aperture, quality lens... as you know. Only old photographs have this secret in mind and one like me, must learn many years to develop the art of photography. And with a great camera, of course! I wish to get a good site that make me happy demonstrating all the relations between the functions of camera with concret examples, not a loose explanation! I know that I'm a dreamer
Best wishes,
Dan