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Quando la parabola viene orientata in senso verticale, è
essenziale verificare che sia ruotata di un angolo sufficiente-
mente ampio, in modo che il soggetto non venga raggiunto
da luce diretta. Il riflettore, quindi, si deve trovare almeno a
60° con fermo a scatto.
La luce diffusa rinviata dalla superficie riflettente offre un’illu-
minazione tenue del soggetto. La superficie riflettente deve
essere bianca o di colore neutro nonché priva di rilievi (ad
esempio le travi in legno di un soffitto) che possono produrre
ombre indesiderate. Può invece essere del colore desiderato
se si vogliono ottenere effetti creativi.
Vi preghiamo di osservare che il campo d’utilizzo del
flash si riduce notevolmente con il lampo riflesso. Per
un’altezza normale di una stanza si può utilizzare la
seguente formula per determinare il campo d’utilizzo
massimo:
numero guida
campo d’utilizzo = –––––––––––––––––––––––––
(distanza d’illuminazione x 2)
En el giro vertical del reflector, hay que tener en cuenta de
hacerlo con un ángulo suficientemente grande para que no
pueda llegar luz directa del reflector al sujeto. Por tanto,
girar como mínimo hasta la posición de retención de 60º.
La luz difusa reflejada por las superficies de reflexión ofrece
una iluminación suave del sujeto. Las superficies reflectantes
han de ser de colores neutros o blancas y no deben presen-
tar estructuras (por ej. traviesas de madera en el techo), que
podrían producir sombras. Para producir efectos cromáticos,
se eligen superficies de reflexión en el correspondiente color.
FHay que tener en cuenta que, con luz indirecta de
flash, se reduce considerablemente el alcance del
destello. Para una altura normal de la habitación, se
puede calcular el máximo alcance, con la ayuda de la
siguiente fórmula:
número - guía
Alcance = ––––––––––––––––––––––––––
(distancia de iluminación x 2)
121


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