So the exercise on p47 is designed to show how just by changing focal lengths you can change the whole context of your image. For example, here I’ve taken a few detail shots of a church. It could be a church anywhere in the UK, a nice tranquil village green perhaps? The clock detail below was taken at focal length 130mm.
For these next two shots, I zoomed out a little (95mm and 50mm), hints of the buildings behind the church show that it might be in an area with some housing, maybe a town centre? Still pretty leafy though.
Standing in the same spot and just by zooming out you get a whole new context for this church which is actually in the centre of London right by 30 St Marys Axe (known as the gherkin building to you and me). Bustling with cars and city workers on their lunch break. This shot at 18mm shows the contrasting architecture, the old and the new juxtaposed.
OCA Art Of Photography 