Leica VARIO-ELMARIT-SL 1:2.8-4/24-90 ASPH. Notice D'utilisation page 20

Les langues disponibles

TAKING PHOTOGRAPHS WITH AUTOMATIC EXPOSURE AND BY MANUALLY

SETTING SHUTTER SPEED AND APERTURE

The Leica Vario-Elmarit-SL 1:2.8-4/24-90mm ASPH. has a variable shutter speed, i.e. the effective

aperture opening depends on the focal length set. For example, if the aperture value of 2.8 is set at

24mm, the aperture corresponds to the value displayed. At longer focal lengths, the actual opening

reduces and, finally, at 90mm the second value 4 specified in the name of the lens applies. Thanks to

light measuring by the lens, however, the right amount of light is always measured in all exposure

modes. However, to prevent incorrect exposure, the desired shot composition (focal length choice)

for the subsequent shot must be identified before the measured value is saved or the time/aperture

combination is changed. This also applies to flash mode with manual setting of the output or

computer control on the flash unit. In both cases, the aperture setting on the flash unit must always

correspond to the actual aperture opening. However, when a system flash unit is used and the TTL

flash exposure control, the actual aperture opening is automatically transmitted so that the correct

exposure is always guaranteed.

LENS HOOD

The Leica Vario-Elmarit-SL 1:2.8-4/24-90mm ASPH. is supplied with a lens hood

ideally matched to

optical paths. Thanks to its symmetrical bayonet it can be fitted quickly and simply, or vice versa for

space-saving storage. In both cases, when the lens cover is removed, it is initially fitted so that one of

the index points on the lens hood

is precisely opposite the index point on the front mount of the

lens

. In this alignment, the lens hood is fitted and turned by approx. 30° until it clearly engages,

audibly and noticeably. For as long as the camera is being carried and used ready for photography,

the lens hood should alway remain fitted. It provides effective protection against contrast-reducing

stray light and also against damage and soiling of the front lens, e.g. from accidental fingerprints.