This exercise is designed to show the difference between focal lengths and angle of view. A "standard" focal length is one which produces the same magnification and view you would see if viewing the same scene with the naked eye. In a full frame or 35mm format the "standard" focal length is accepted as being 50mm.
In this exercise, I took 3 photos from the same location at 3 different focal lengths to show the varying angles of view. The photos were printed to A4 size to measure the distance from my eyes to the photo mounted on the wall, when held at a distance that appears to make the objects in the photo the same size that they are in real life.
*Over the course of this exercise I noticed a rough correlation between focal length and viewing distance. E.g. 20cms at 12mm is roughly 1/3 of 60cms at 35mm, which in turn is roughly half of 120cms at 70mm.
This first photo was taken at a focal length of 35mm, which on a 1.5x crop sensor is roughly equivilant to 50mm on a full frame sensor. To view the print so that it appears to be the same size as the photo on the wall, I held it at a distance of approximately 60cms.
This second photo was taken at a focal length of 12mm, approximately equivilant to 18mm on a full frame sensor. To make this print appear life size, it was held at a distance of approximately 20cms from my eyes.
This shot was taken at a focal length of 70mm, roughly equivilant to 105mm on a full frame sensor. to make the print appear life size, it was held at a distance of approximately 120cms from my eyes.
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