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Remarques techniques—Accessoires optionnels
Les objectifs avec microprocesseur sont identifi ables grâce à la présence de contacts élec-
triques CPU. Les objectifs de type G sont marqués d’un G sur la monture de l’objectif et
ceux de type D d’un D.
Objectif avec microprocesseur Objectif de type G Objectif de type D
Les objectifs de type G ne sont pas équipés d’une bague des ouvertures. Contrairement
aux autres objectifs avec microprocesseur, ils n’ont pas besoin d’être verrouillés sur leur
ouverture minimale (valeur la plus grande).
Angle de champ et focale
L’ angle de champ du D200 est inférieur à celui d’un appareil photo 24 × 36. Lorsque vous
calculez la focale des objectifs pour le D200 en format 24 × 36, vous devez multiplier la
focale de l’objectif par environ 1,5 :
Option Focale approximative (en mm) en format 24 x 36 (modifi ée pour l’angle de champ)
Appareil photo
24 × 36
17 20 24 28 35 50 60 85
D200 25,5 30 36 42 52,5 75 90 127,5
Appareil photo
24 × 36
105 135 180 200 300 400 500 600
D200 157,5 202,5 270 300 450 600 750 900
Les dimensions de la zone exposée avec un ap-
pareil photo 24 × 36 sont de 24 × 36 mm. Celles
de la zone exposée avec le D200, en revanche,
sont de 15,8 × 23,6 mm. Résultat, l’angle de
champ d’un appareil photo 24 × 36 équivaut à
environ 1,5 fois celui du D200.
Calcul de l’angle de champ
Taille de l'image (D200)
Taille de l'image (reflex 24×36)
Objectif
(15,8 mm × 23,6 mm)
Diagonale de l'image
(24mm × 36mm)
Angle de champ (format 24×36)
Angle de champ (D200)
186


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