I picked up this lens for a song and now I know why: it won't focus to infinity. At most I can focus on objects about 3 feet away, but the distance scale is completely off and says that it's focused at about 8-9 feet. Objects at infinity are totally blurry.
Does anyone know how to adjust focus on this lens? It's one of the earliest EF lenses and makes for a great "adjustable prime"/"adjustable normal" lens for bright light, as Mike Johnston calls lenses with narrow zoom ranges.
I was reading this blog post by Roger Cicala today that says that Canon EF lenses are adjusted for infinity focus solely by the thickness of the mount, unlike Nikon lenses which use shims. He writes, "Canon bayonet mounts come in various thicknesses, so rather than shimming they simply choose the correct thickness mount when they assemble the lens." Does that mean I have to buy a replacement mount that is thinner than the one I have? I checked the auction site and they don't sell mounts by different thicknesses, so I'm not sure what's going on.