Have you ever been disappointed to find the eyeballs of your subject to be not as sharp as you had expected even though your camera confirmed that autofocus had locked onto them? Photographer Steve Perry of Backcountry Gallery made this 9.5-minute video explaining how he avoids this “false positive autofocus trap” when focusing in tricky situations or on tricky subjects. “The dirty little secret is that the phase-detection AF system in our cameras just isn’t perfect,” Perry says. “Although it’s…