5dmark3

trying to use manual focus. i have the 24mm-105mm lens switched from auto to manual. i also switch to viewfinder /video live view and magnify x5 to zoom in and then turn the focus ring but it isn't getting sharper. what am i doing wrong? using mark 3 5d

i'm looking to invest in a quality tripod that'll last me quite a few years so I'll be able to spend a decent amount on one. I need a sturdy one that can hold a big camera like a camera 5d mark 3. I may throw in some big lenses when I shoot still images or make cinematic videos. I don't know...