steves advice is great.., 50 mm is close to how we see., when we look straight on.., this is somewhat controversy here at SM.., but thats what i was taught at uni.., jay told me here that our eyes were closer to 28 mm.., im wondering if the stereo view (two eyes combined0 somehow makes a total of 50mm.., but its just s theory and im raving on too much now.., again!! i should look (pun) into it more closely.

you can avoid 3 point perspective if you are doing high-rise, urban environment using camera off set

this will stop the 'stretching of the image and is something all architects are aware of and avoid.

this is three piont perspective