To give you an idea what the view of the field is like from Grandstand 12, here is a Youtube video shot from there during a Red Sox game at Fenway Park.
Pretty average section down the first baseline. There are 18 rows to this section, it is extremely tight and crammed. Seats aren't the most comfortable. There is a beam that obstructs your view of 2nd base from some of these seats. I would avoid grandstand sections almost altogether because of the obstructions. Go with the bleachers.
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