Exercise 2.7

Brief :

Use a combination of small apertures and wide lens to take a number of photographs exploring deep depth of field.

Because of the small apertures you’ll be working with slow shutter speeds and may need to use a tripod or rest the camera on a stable surface to prevent ‘camera shake’ at low ISO.

Add one or two unedited sequences, together with relevant shooting data and an indication of your selects, to your learning log.
Achieving deep depth of field might appear easy compared to the difficulties of managing shallow depth of field.

We’re surrounded by images made with devices rather than cameras whose short focal lengths and small sensors make it hard to achieve anything other than deep depth of field.

The trick is to include close foreground elements in focus for an effective deep depth of field image.

Foreground detail also helps to balance the frame, which can easily appear empty in wide shots, especially in the lower half.

When successful, a close viewpoint together with the dynamic perspective of a wide-angle lens gives the viewer the feeling that they’re almost inside the scene.

Process :

The process was pretty much the reverse of the last exercise.

This time I used my widest lens setting, 18mm. and closed it down to the high f-stop numbers, the distances remained the same as did some of the subjects; this enables me to truly compare the effects of aperture and lens length.

Pictures :

f 22     1/10th. sec.

 

f 14    1/60th. sec.

f 14    1/8th. sec.

f 22     1/15th. sec.

f 20     1/20th. sec.

f 18     1/25th. sec.

f 16      1/125th. sec.

f 14      1/30th. sec.

f 13      1/40th. sec.

Contact sheet.

Analysis :

A wide-angle lens also distorts the image somewhat.

Despite having a depth of field measured in feet and inches the background is more discernible than in the previous exercise.

The second and third shot are of the same subject, just different directions to give you some idea of how much background an 18mm. lens includes at higher f-stop numbers.

Reflections :

The equivalent to these photo’s on a full frame camera would be 27mm. and f 33.

Not the widest of angles or deepest of depth of field but enough for me to be careful how to use these combinations.

I can’t wait to be able to get a full frame camera and some faster glass, then at least these mathematical gymnastics would come to an end.

Every You tube video and every text-book references to 35mm. full frame .

As I grew up on 35mm. film I tend to reference images the same way.

The effects of lens length, focal distance and aperture however remains a constant, for this I am thankful.

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Author: ashley516543

Mature photography student living in London.

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