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21Abr/1169

APS-C (Advanced Photo System)

Originalmente el APS-C (Advanced Photo System, Sistema Avanzado de fotografia tipo C Clasic) es uno de los posibles formatos del sistema APS de fotografía.
Es un formato de 25.1 x 16.7 mm, de lo que resulta un ratio de 3:2 que es el clásico en la fotografía de 35mm.
Posteriormente este término se ha empleado para referirse a uno de los tamaños posibles en los sensores de las cámaras digitales, en realidad son tamaños aproximados.

 

El FF es un sensor de tamaño 24x36mm, o lo que es lo mismo, similar a la vetusta película de 35mm y lo portan la mayoría de los cuerpos profesionales. El APS-C es un sensor de menor tamaño que montan Sony, Sigma, Nikon en sus DX y Canon en algunas de sus cámaras aunque en el caso de Canon lo hacen con un tamaño un poco menor. Olympus, por ejemplo, monta un sensor de 4/3 que es aun más pequeño que el APS-C, pero hoy quiero centrarme en el de Canon, luego veréis por qué.

Entre las ventajas que tienen los sensores FF con respecto a los APS-C destaca la gestión del ruido al recibir más cantidad de luz por su tamaño y la capacidad de conseguir mejores resultados a la hora de crear enfoques selectivos. Podemos decir, en general, que el FF obtiene imágenes de mayor calidad que los sensores más pequeños que también tienen sus ventajas y vamos a verlas ahora:

Proporciona cuerpos y lentes mas livianas y baratas
Facilita composiciones con grandes profundidades de campo
Mayor cantidad de objetivos disponibles
Hasta aquí todo bien, cada sensor tiene sus vicios y sus virtudes y en función de nuestras necesidades nos convendrá uno u otro. Para mí, la mayor diferencia, por encima de otras como la calidad que hoy en día no difiere excesivamente, es el recorte que los sensores más pequeños producen sobre la imagen.

Imaginemos una fotografía y supongamos a su vez que la hemos realizado con una cámara de fotograma completo y una lente de 50mm, si ahora usamos una cámara con un sensor APS-C y el mismo objetivo para tomar la misma fotografía veremos que obtenemos una imagen recortada con respecto a la primera. Usar un sensor FF supone, por ejemplo, que podemos volver a encuadrar nuestra imagen en el procesado. Entiendo que es un concepto un poco complicado tanto de explicar como de captar la primera por eso os traigo hoy una comparativa que ha realizado el fotografo Mike Collins sobre esto mismo, usando una Canon EOS 5D MkII y una Canon EOS 7D. Sin más os dejo con ella.

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