Lugged the gear around for 8 hours yesterday starting at 5:30 AM. Although some shots were nice - not one WOW! I did get an OW! though - as in "Ouch' It hurts to raise my left shoulder." A 10 pound tripod/camera combination plus 15 pounds of backpack will do that. I had noticed twinges after my normal 2-3 hour outings and now this.