Slides are really amazing: last week I was at my uncle place and we got on projector some 30-40 years old slides. Colors are just unbelievable - like it was taken yesterday, on size cca 1x1,5 meters there was no grain, beautiful contrast and vivid colors with 3D pop up.

And my uncle did no used Leica or some fancy SLR cameras: slides were made with agfa sensor rangefinder, some old kodak cameras... My cousin was planing to scan those slides - but on the end he saw that true "power" of slides is in projecting them on big screen, and gave up of scaning