Originally posted by JinDesu That's normal for some lenses. Not every lens will be at exactly infinity when the focus ring hits the end as some do go past. I don't know why (someone else can enlighten us), but it's not abnormal.
I never gave much thought to it before, but assumed that focusing past infinity allowed for manufacturing tolerances and temperature expansion. I just did a quick bit of reading and learned that autofocus lenses use it to prevent slamming the lens during focusing. It's also more common in zooms than primes.