© 2015 Steve Chesler | Rochester Redwings Shortstop Argenis Diaz tags out Scranton/Wilkes-Barre RailRiders Pitcher Brady Lall at second base. The Sigma 150-600mm Sport lens quickly locked on focus at second base and then pressing the AF-L button on the D300 locked the focus to avoid having the focus jump to the back of the sliding runner.