Page 116 - (DK) Advanced Photography Guide

114 APPLYING | EXTENSION TUBES

FOCUSING CLOSER

Extension tubes let you temporarily modify any lens an aperture ring. Extension tubes with electronic
so that it can focus closer than usual. The simplest contacts are far more convenient. These let you set
extension tubes do not maintain an electronic the aperture via the camera, and allow autofocusing.
connection between the lens and camera, so you Infinity focus (see p.66) is not possible with extension
have to set both the focus and aperture manually, tubes; if you want to shoot a distant subject, you will
although the latter is only possible on lenses with need to remove them.

USE A TRIPOD PICK AN EXTENSION TUBE SELECT APERTURE PRIORITY
Shooting at high magnifications Choose the level of magnification The higher the magnification, the
always results in light loss and longer you want to shoot, and combine the narrower the depth of field that will be
shutter speed times. Use a tripod appropriate lens and extension tube. produced. The Aperture Priority mode
to lower the risk of camera shake For the highest magnification, use a wide- will give you the necessary control
without the need for a high ISO. angle lens with the maximum extension. over aperture and depth of field.

FOCUS THE LENS SET THE APERTURE
Take extra care when focusing to make sure the most You often have to use very small apertures when shooting
important area of your subject is sharp. Use Live View on close-ups. If the image is underexposed, you may need to use a
your camera’s LCD screen and zoom in on the image to check flash. However, using larger apertures, such as the one shown
the critical focus. here, and a narrower depth of field can suit some subjects.

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