Take this lens I have for example, it has red values on the distance scale (not sure what do you call it exactly) next to the focus ring. What does these values mean?
Answer
EDITED FOR 2 CASES
If the markings show aperture values, those are hyperfocal-distance markings. It lets you know where the hyperfocal distance is at each full F-stop.
For example, one of the lines has a 16 in red next to it. That will let you set the focus to the hyperfocal distance at F/16.
If you do not know what the Hyperfocal-distance is you can read this short article. It even has a calculator to calculate the distance for you.
If the markings show focal-lengths, those are infrared focusing lines. They are used to adjust your focus for infrared photography.
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