I project both 6x6 and 35mm slides. Recently, I got a Rollei P66 projector for 20eur or so, and two nice Leitz projectors for 35mm for another 20eur, so it does not have to be always that expensive. It gives me the advantage of being able to project old family slides in addition to slides that I shot. Btw. most of the old slides (60īs) are ok, just some turn to magenta color. It depends on the material, I guess. Not to mention making and projecting 3D slides, that is a nice hobby too...