I'd like to ask something about manual focusing those of you, who are experienced with this technique. I understand that, it's not a problem while shooting landscape on a tripod. But what, when the subject is not still? Is even possible to maintain the subject in focus in this case? I also understand that this would not be a big issue if shooting with an ultra-wide angle lens like 15 mm. In this case almost everything is in focus anyway.
I get this question now, when Zeiss is going to announce their 85mm f/1.4 lens. Whit this lens, DOF should be really shallow. Is even possible to shoot something handheld with this lens? Or even more extreme example: Is even possible to shoot handheld a moving subject?
Many action shots in the days of manual focus were 'zone focused' ie you focus on a predetermined point and then the action reaches that point you shoot. In those days a very shallow dof action shot was rare and potentially valuable, whereas now they are everywhere.
Tracking with manual focus is possible with practice and skill, but in reality requires a greater dof. If someone is going to shoot a manual 85/1.4 @ 1.4 without live view they are going to need an 's' screen and good eye sight to get even something that is stationary sharp, let alone moving.