Insect Photography by John Bebbington

Author:John Bebbington [John Bebbington]
Language: eng
Format: epub
ISBN: 9781847975010
Publisher: Crowood
Published: 2012-07-14T16:00:00+00:00

Fig. 5.22

With a 100mm focal length lens, the angle of view is only a quarter as wide, and only a sixteenth as much of the landscape (magnified sixteen times) is included compared with the 24mm lens. The landscape appears far less sharp at the same aperture.

If you use a wide-angle lens and the camera back is not vertical, perspective distortion may occur – verticals may converge or diverge, or horizons may curve. This can of course be corrected in digital processing – but it makes for extra work.

With wide-angle lenses there is an apparent increase in depth of field. Actual depth of field is not materially affected by the focal length of the lens; for example depth of field at a magnification of 1:4 (×0.25) at ƒ22 should be 25mm, whether the focal length of the lens is 24mm, 50mm, 100mm or 200mm. The reasons for apparent depth of field differences are shown in Figs 5.20–5.22.

Fig. 5. 23

Orange-tip butterfly Anthocharis cardamines roosting, Somerset, UK. Pentax K-5 on tripod with Sigma 50mm macro lens, 1/60sec ƒ16, ISO 1600. There is a great deal of background ‘clutter’.

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.