I took the attached panorama in Athens just recently ( I wanted to photograph this old library before the looters got to it! ).
Anyway I can't obtain an architecturally straight building. I've tried in CS5 and PTgui the latter software has great options to straighten the image but not enough for this one.
I took the image as a multi row, a friend thinks it's possible that I didn't take a row of images exactly level with the ground. In other words I did a row for the sky facing up, a row for the ground facing down but the one which should have been at zero degrees was perhaps out a bit.
So my question is:
Is it essential when taking a multi row pano like this to take a row at exactly zero degrees?