Here's one with one of my favorite vintage lenses, the SMC Takumar 55mm f/1.8 M42 lens. This was a kit lens with a lot of Spotmatic cameras back in the day. It is a tiny little thing, but it's optics and color rendering are not vintage at all - it is a sharp, contrasty, and has great color. Best of all, it works flawlessly on modern FF bodies with no mirror hang. Because of it I actually ditched my EF 50mm f/1.4 (I don't shot 50mm a ton, and between this vintage glass and my Tamron 24-70 VC I have 50mm covered nicely).