In this exercise I explored the effect of the field of view when the focal length is changed. My camera was mounted on a tripod and I attached my 70-200 telephoto zoom lens to it. Starting with the lens set to 200mm I took a series of images reducing the focal length of the lens for each shot. When I reached the minimum focal length of the lens I replaced it with my 17-55mm lens, being careful not to move my camera during the process. I then repeated the process with this lens. My results are shown below.
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| Focal length: 200mm |
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| Focal length: 165mm |
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| Focal length: 127mm |
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| Focal length: 93mm |
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| Focal length: 75mm |
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| Focal length: 55mm |
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| Focal length: 46mm |
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| Focal length: 35mm |
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| Focal length: 23mm |
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| Focal length 23mm, cropped to have similar field of view as 200mm |
I observed that as the focal length was reduced the field of view was increased. I noticed that the centre of the wide angle image shot at 23mm is simply a reduced version of the image taken at 200mm. I have shown this by cropping out the centre of the 23mm image and placing it above.
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