Project: The Intensity of Light

Exercise: Measuring Exposure

Part 1

This exercise is in two parts; for part one produce between four and six photographs which are deliberately lighter or darker than average, and say why.  

Image 1: f/11 ISO 100 1/180″ 21mm +1 stop

Image 1a: f/11 ISO 100 1/180″ 21mm

Image 1: received a +1 stop increase in exposure from Image 1a: to lighten it.  I felt this was required as the Spinnaker Tower is quite dark in Image 1a: probably because the light measured tried to average the sky which also appears more overcast than it actually was.  By increasing by +1 stop, I feel that Image 1: is now correctly exposed.

Image 2: f/11 ISO 100 1/10″ 55mm -1 stop

Image 2a: f/11 ISO 100 1/10″ 55mm

Whilst this image isn’t the best one I’ve ever taken from a technical point of view, it does illustrate the point of the exercise extremely well.  Image 2: has been darkened by -1 stop; this was necessary as the light was metered on a single point of the people within the frame.  They are clearly a lot darker than the background and it was therefore over-exposed as a consequence.  Dropping the exposure by -1 stop cured the problem.

Image 3: f/6.7 ISO 100 1/20″ 18mm +1.5 stop

Image 3a: f/6.7 ISO 100 1/20″ 18mm

Image 3: has received a +1.5 stop increase on Image 3a: to compensate for the light average being over-influenced by the highlights from the roof skylights.

Image 4: f/8 ISO 100 1/500″ 27mm +1.5 stop

Image 4a: f/8 ISO 100 1/500″ 27mm

Image 4: has had to be lightened by +1.5 stop as the image was made into the sun and decreased the exposure needed because of the enormous amount of light available.  This made the boats underexposed and therefore an increase of 1.5 stop was required to redress the balance.

Image 5: f/10 ISO 100 1/180″ 24mm -0.5 stop

Image 5a: f/10 ISO 100 1/180″ 24mm

Image 5: needed to be reduced in exposure by -0.5 stop.  The amount of darker shades in the image tended to overexpose the whites and under expose the really dark of the slipway under the water and generally making it look washed out.  By changing by such a small amount made an enormous difference to the outcome.

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