A bit too late to drop in but ok, here I am! I admit, I IM'ed and as mentioned by Onslow, it is the usual lens distortion. By using Photoshop transformation (perspective) I have tried to put the buildings more straight. I noticed the slanting buildings (why do I always notice that, am I *that* linear LOL) and usually i take a piece of paper to check out on the screen. You can see the results here. In earlier days there were (very) expensive technical camera's, where the backside of the camera (on which the focused image is projected) can be changed in direction to prevent the distortion (works only for perspective, not for fisheye wide angle lenses). Does this all make any sense or am I just bugging?