Exercise 2.1

This is the first exercise in Part 2 of the EYV course, Imaginative Spaces and we are now using the camera in Aperture Priority mode, meaning I can select the aperture but the camera will select the shutter speed and ISO.  This exercise requires finding a scene with depth and from a fixed position taking a sequence of images shot at different focal lengths without changing viewpoint.

I own three prime lens only ,so showing 5-6 focal lengths isn’t possible for me, but the effect is still visible. To make up for only having 3 focal lengths available, I have repeated the exercise.

My lenses

  • a 16mm f1.4 lens, equivalent to a 24mm lens on a 35mm camera with an angle of view (diagonal) of 83 ˚
  • a 35mm f2 lens, equivalent to a 53mm lens on a 35mm camera with an angle of view (diagonal) of 44˚
  • a 56mm f1.2 lens, equivalent to an 85mm lens on a 35mm camera with an angle of view (diagonal) of 29˚

Image set 1

What these images show is a changing angle of view, however the perspective has not changed in these views which I can demonstrate by cropping the first two images to give roughly the same image as the third, see below:

Although these images all have slightly different apertures, f13, f11 and f5.6 respectively, bar any distortion in the lens and slightly off centre cropping we can see that the perspective in each scene is the same.

Image set 2

In the first set of images I maintained my viewpoint by leaning against a traffic signpost.  In this second set of images I used a tripod to keep the point of view absolutely fixed.

In both image sets it is clearly the central image which most closely accords to the perspective of the human eye, however the field of view is definitely much wider and taller than even the widest lens used here.


Bibliography

  1. Bloomfield, R (2014) Photography 1: Expressing your Vision., OCA 2017, p.41