y use a medium format 645 mamiya ,really easy like a 24*36,with epp 120 ,after y give the slide to a photograveur for the scan(y have a nikon scan 8000 but y think it's not enough quality ) then after y tranforme on my computeur with photoshop 7 ,for the sharp if you see a print 40*30 or more ,you can tell it's really sharp,(by the way it's a try for a singer maybe soon in the top something ah ah ah :)