clase 2 basico
DESCRIPTION
Exposicion y tareasTRANSCRIPT
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Luz y Exposición
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Exposición
• Depende de la cantidad de luz que pasa a través de un objetivo por un tiempo determinado
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Exposición
• En este proceso intervienen los siguientes factores:
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• Sensibilidad de la pelicula (ISO)
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Películas Lentas y rápidas...
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Películas Lentas...
• Necesitan mas luz para lograr una mejor exposición
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Dias soleados
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Playa
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Películas Lentas...
• Una película con menor numero de ISO es lenta (necesita mas luz para crear una imagen)
• 25, 64, 100 y 200
• Menos granos (analoga)... menos ruido (Digital)
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Películas Rápidas...
• Necesitan menos luz para lograr una mejor exposición
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Conciertos
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Bodas / Eventos
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Baja luz
ISO 12,800Joe Mcnally
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Películas Rápidas...
• Una película con mayor numero de ISO es rápida (porque necesita menos luz para crear una imagen)
• 400, 800, 1000, 3,200, 6,400 o mas
• Mas granos... mayor ruido
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Ruido digital
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ABERTURA
• La abertura es el diámetro del diafragma situado en el interior del objetivo.
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ABERTURA
• Cuanto mayor sea la abertura, mas cantidad de luz llegara a la superficie del sensor
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Abertura
• El tamaño de la abertura esta indicado por números f/
• f/1.4 - f/2 - f/2.8 - f/4 - f/5.8 - f/8 - f/11 - f/16 - f/22 - f/32
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Abertura
• Entre mas pequeño el numero, mayor será la abertura
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¿Para que sirve?(aparte de dejar entrar mucha o poca luz)
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Apertura Grande / Numero Pequeño
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Apertura pequeña / Numero grande
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Eliminemos los distractores
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f/2.8 f/6.3
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Velocidad de obturación
• La velocidad de obturación controla el tiempo en que las laminas del obturador permanecen abiertas.
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Velocidad de obturación
• Cuanto mas largo sea el tiempo de obturación, mas luz llegara al sensor digital.
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Velocidad de obturación
• Las velocidades están indicadas en segundos y en fracciones de segundo en un dial situado en la cámara.
• Las velocidades mas comunes son: 1 segundo, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500, 1/1000 de segundo.
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¿Para que sirve?(aparte de dejar entrar mucha o poca luz)
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Técnica de barrido.... Panning
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• Usar modo de Velocidad / S - Nikon y Sony / Tv - Canon
• Usar velocidades lentas - 1/30 o 1/60
• Seguir al objeto durante se toma la foto...(barrido)
• Usar disparo continuo o Burst mode (varias fotos)
• Prueba y error....
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Velocidad Uso1/2000 Congelar aves en movimiento
1/1000 Congelar Carros, motos, etc en movimiento
1/250 Gente en movimiento1/125 Vehiculos con tecnica barrido1/30 Ciclistas con tecnica de barrido1/15 Personas corriendo con tecnica de barrido1/4 Gente en movimiento borrosa
1 segundo Efectos de seda en agua
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Velocidad alta = 1/5000 1/1000
Velocidad lenta = 1/5 1’’
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Lente cerrado = f/32 f/22
Lente abierto = f/1.4 f/2.8
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Compensar, compensar, compensar
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Entre mas abra el lente (lente abierto) tengo que compensar con la velocidad (velocidad rapida)
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Entre menos velocidad ponga (velocidad lenta) mas cerrado debe estar el lente (lente cerrado)
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Combinación de abertura y velocidad
• Ciertas combinaciones de abertura y velocidad dan lugar a una exposición equivalente. La misma cantidad de luz llega al sensor.
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Combinación de abertura y velocidad
• Un diafragma muy abierto (f/1.4) y una velocidad de obturación elevada (1/1000) nos darán una profundidad de campo escasa y la posibilidad de detener el movimiento.
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Combinación de abertura y velocidad
• Una diafragma bastante cerrado (f/22) y una velocidad de obturación lenta (1/4) nos darán una profundidad de campo mayor pero menor control del movimiento.
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Diafragma muy abierto y velocidad elevada f/1.4 y 1/1000
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Diafragma muy cerrado y velocidad lenta f/22 y 1/4
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Como lograr la correcta exposicion....
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Una combinacion de apertura y velocidad...
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• Modo Manual: Se maneja la abertura y velocidad de acuerdo al gusto del fotografo.
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Fondo borroso???
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Profundidad de campo...Tuesday, October 15, 13
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• Es la zona de nitidez aceptable en una fotografía
Profundidad de campo
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• Distancia focal (Tipo de lentes a utilizar)
• Distancia del objeto
• El punto de enfoque
• La abertura del diafragma
Profundidad de campo
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Distancia del objeto...
• Entre mas cerca, menor será la profundidad de campo
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El punto de enfoque...
La profundidad de campo se extiende un tercio por delante y dos tercios por detrás del punto de enfoque
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1) Fotografiar un objeto con abertura grande y pequeña
2) Fotografia congelando mov y otra enseñando mov
3) Fotos utilizando ISO alto y bajo
Tarea...
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1) Reto de los 7 dias
Exposicion...
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1-Nubes2-Algo Verde
3-Un mal habito4-Alguien que ames
5-Recuerdo de la niñez6- Un atardecer
7-Ojos
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Op 1) Subir a la pagina del FB
Op 2) Llevarlas en USB a la proxima clase
y despues?????...
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