Originally posted by godwinaustin 10 feet is the last finite focusing distance on the lens, and then the infinity symbol, so how can I set focus at 45 feet?
Well, you can't I guess, but on a longer lens (or a lens with a longer focus throw) the hyperfocal point will be available so just something to keep in mind.
Quote: What does infinity represent as a near focus point?
In this case 45 feet (and beyond) -- there is essentially no distance past 45 feet if that makes sense. If you want the maximum sharpness that far out, you'd focus on infinity, and so something 45 feet away would show the same sharpness as a shot of the moon. But if you want maximum depth-of-field to also get "acceptable focus" on objects 22.5 feet - 45 feet away, you'd focus on the hyperfocal point instead on the lens (if you could) and now something 45 feet away will show maximum sharpness, but the moon would be ever so slightly softer but still "acceptable", as would objects say 30 feet away (which would be very soft if you focused on infinity instead).