Exercise 24: Control the strength of a colour

The brief for this exercise was to find something with a definite colour and choose a viewpoint so that the colour fills the frame.
Then, find the average exposure setting, in my case suggested by the camera as (1/200sec at f/5.6) and take a sequence of photographs all composed the same but differently exposed from bright to dark.
The idea was to start at one stop brighter than the suggested meter reading then stop down the aperture by half a stop each time.

Photograph 1: One stop brighter than suggested 1/200s, f/4.0

EF24-105mm f/4L IS USM Lens, 105mm, 1/200s, f/4 ISO100

Photograph 2: Half a stop brighter than suggested 1/200s, f/4.5

EF24-105mm f/4L IS USM Lens, 105mm, 1/200s, f/4.5 ISO100

Photograph 3: Suggested exposure 1/200s, f5.6

EF24-105mm f/4L IS USM Lens, 105mm, 1/200s, f/5.6 ISO100

Photograph 4: Half a stop darker than suggested 1/200s, f/6.3

EF24-105mm f/4L IS USM Lens, 105mm, 1/200s, f/6.3 ISO100

Photograph 5: One stop darker 1/200s, f/8

EF24-105mm f/4L IS USM Lens, 105mm, 1/200s, f/8 ISO100

These images show how altering the exposure also alters the saturation of the colour from dull/weakly saturated to highly/over saturated .  This change in saturation gives the illusion of a colour change from the orange end of red toward the purple end.
Exposure, its effect on images and how to control it is something I am struggling with on the course and hopefully this chapter might improve things a little.