The aim of this exercise was to determine the standard focal length of my equipment (for which I used my 18-55 kit lens), before viewing the same scene with a wide angle and a zoom lens viewing the same scene.
For consistency I used the same shutter speed, aperture and ISO for all three images to see what effect focal length has on depth of field.
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Image 1 - standard focal length - 50mm, 1/6 secs at f/8, ISO 200
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I identified the standard focal length of my kit lens by viewing the scene through the viewfinder with my right eye, and comparing this to the image through the naked eye. The standard focal length of my 18-55 kit lens is 50mm.
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Image 2 - wide angle - 10mm, 1/6 secs at f/8, ISO 200
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Using my Sigma 10-20 wide angle lens of course gave a much broader perspective of the scene.
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Image 3 - zoom - 200mm, 1/6 secs at f/8, ISO 200
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The greatest surprise when using the Sigma 70-200 zoom lens isn't the extent to which it closes the viewing angle or the extreme close up; it's the much narrower depth of field in comparison to the previous images. (The flower on the door is sharp, yet the spots on the window shutters are not.)
It has proved a very beneficial exercise in understanding focal lengths and their relationship to angles of view. In addition, recognising the significant narrowing of the depth of field when the focal length increases has been a key learning point.
(Specific focal lengths for each shot will follow once images are printed.)
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