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Originally Posted by Saphire
I have just run some tests with the 100-400 lens @ 100mm, 150mm, 200mm, 250mm. All were at the same F stop and speed. I can see how the background is affected by the changes in distance and focal length. I am still finding this very hard to take in.
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Excellent shots to show how the distances between camera, subject and background affect the perspective. That's the first half of the experiment.
The second half is to take the same scene at a variety of focal lengths - without moving the camera. Then take the resulting images and crop them all so that they show the same portion of the image. Then resize them all to the same dimensions. You should end up with a series of shots that look identical (apart from the obvious degradation in quality of the resized ones).
You then have two series of photos.
One where Focal Length and Distances have been changed - and where perspective changes.
T'other series, where Focal Length and Magnification have changed, will show no change in perspective.