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I am sure my screen is spot on. That is very easy to verify as this Zeiss has 30mm MFD. (I even use my MP50 to make sure my screen installation) I am not the only one complain the difficulty of focus this particular 35mm.
The problem for me might because of 35mm focal length, if distance is longer, DOF is kind of deeper, so eye will hard to tell critical focus. If distance is shorter, it is very sensitive to movement and shooting angle. On the other hand, once viewed at 100%, it is surprisingly sharp to be able to show focus error.
Again, give me enough time, I am sure I can nail the focus with very high keeper rate on any lens mentioned. Just turn back and forth focus ring to fine tune focus by eyes. I am talking about tracking kids with less than secs to be able to focus. (not necessary moving kids, but once see some interesting moment, I am able to capture it quickly.)
The difficulty of focus is combined result from focal length and lens optical character. On the other hand, Carsten seems OK with this 35mm. what can I say?