This is the question for people who have experience with manual focus lenses. i have an opportunity to acquire Zeiss 135 f2 for a decent price but hesitate because of MF. I do not really trust my own eyes when it comes to manual focusing and doing 3 things at the same time (holding camera, holding the focus button, and focusing) might not be so easy. i do not use tripod very often and mainly shoot my kids in action, portraits, weddings and some sports. i really like the focal length and the aperture and also own the Canon version. Any advice would be appriciated