The three images were shot using a 70 - 300mm lens at f9. Focal lengths were varied and respectively are 300mm; 108mm and 70mm. All were shot using a tripod from the same position.
The top image forces the viewer to focus on the windmill as it is central to the image. The distance between the camera (approximately half a mile) is compressed to such an extent that the hedgerow, the roof of the house and the windmill seem to be relatively close together whereas they are separated by quite some distance. By zooming in on the windmill the surrounding countryside is 'cut' from the picture giving limited information about the environment around it.
The second image still keeps the windmill centred in the image but now more of the surrounding countryside is included. However the compression of the planes continues. The white house that is close by the windmill appears to be quite close to the red roof in middle distance. In reality the two are separated by about 500 yards.
The third image continues with the windmill in the middle but includes much more of the country side. The foreground hedge and scrubland moves the viewer away from the windmill but the compression of the planes in the middle ground continues. A sense of depth in the rest of the image is created by our knowledge that the smaller an object is in comparison with its expected size the more likely it is some distance away.
The effect of the telephoto lens is created because of the way we 'see' images based upon our experience and memories. We make assumptions about the size of an object (say the house to the right of the windmill that can clearly be seen through the trees) and from that deduce that it is further away if it is smaller than expected. There is no real way to know whether this is true. The house may be a child's doll's house (it isn't as far as I know) and may be closer to us than we believe.
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