Page 111 - (DK) Advanced Photography Guide

L ENSE S 109

METADATA FLANGE FOCAL DISTANCE

Metadata is information embedded in a photo, which you Lenses are designed to focus correctly for one specific
can look at either on your camera or in image software on camera system only. Every camera system needs the
a computer. There are two types of metadata: EXIF and sensor and the lens to be a precise distance apart, a
IPTC. EXIF metadata contains camera information, such as measurement known as the flange focal distance. If
exposure and White Balance settings, and is automatically the lens is any closer than this, it will not be able to focus
added to photos as you shoot. IPTC metadata is added at infinity. The flange focal distance of an SLR is large
later in postproduction and includes information such compared to that of a compact system camera (CSC).
as a photo caption and relevant keywords (see p.178). A CSC lens adapter adds the correct spacing to mimic
The aperture setting is not recorded in EXIF if an adapted the flange focal distance for an SLR lens, which makes
lens is used. If you need that information later, you will it possible to focus at infinity.
need to note it at the time of shooting.

THE RESULT CAMERA SETTINGS
This photo was shot using a 30-year-old lens. Zooming in to the ISO
Live Image to view the subject’s face made it possible to focus on A f/6 1/250 400 AW B
her eyes—the key to a successful portrait. SEC

US_108-109_App_Using_Adapted_Lenses.indd 109 05/02/2018 14:35