Profundidade de campo é a zona de nitidez que se estende anteriormente ou posteriormente ao assunto a ser fotografado. Isto é, tudo que estiver localizado dentro dos limites desta zona estará nítido (Figura 1).
Depth of field (DOF) is the zone of sharpness that extends before or after the subject being photographed. Everything that is located within the limits of this zone is clear (Figure 1).
Depth of field (DOF) is the zone of sharpness that extends before or after the subject being photographed. Everything that is located within the limits of this zone is clear (Figure 1).
Figura 1 – Ilustração da profundidade de campo para
cada abertura de diafragma (Senac)
Figure 1 - Illustration of the depth of field for
each diaphragm aperture (Senac)
Foto feita com f 2.8 (Nota-se o lápis rosa fora do campo)
Photo made with f 2.8 (Note that the pink pencil is out of the field)
O que define este limite é a abertura do diafragma da câmera (Figura 2) e normalmente seus valores variam de f2.8 à f16, mas existem câmeras que abrangem valores de f1.6 a f22. Quanto menor o valor de f, maior a abertura do diafragma e menor a profundidade de campo. Quanto maior o valor f, menor a abertura do diafragma e maior a profundidade de campo.
What sets this limit is the aperture of the camera diaphragm (Figure 2) and its values usually range from f2.8 to f16, but there are cameras covering values of f1.6 to f22. The lower the value of f, the greater the diaphragm aperture and the smaller the depth of field. The higher the value f, the smaller the aperture and greater depth of field.
Figura 2 - Detalhe das aberturas do diafragma (Senac)
Figure 2 - Detail of diaphragm aperture (Senac)
Nas câmeras profissionais a profundidade de campo possui uma regulagem independente, mas na maioria das câmeras portáteis, essa regulagem é feita pelo sensor ótico e se altera automaticamente juntamente com a velocidade de abertura do obturador (próxima postagem).
In professional cameras, the Depth of a field can be adjusted, but most of the portable cameras, this adjustment is made by the optical sensor and automatically changes with the Shutter Speed (next post).
In professional cameras, the Depth of a field can be adjusted, but most of the portable cameras, this adjustment is made by the optical sensor and automatically changes with the Shutter Speed (next post).
Abordagens mais simples de alguns autores indicam que proporção da profundidade de campo possui valores entorno de 1/3 adiante do assunto e 2/3 atrás do assunto, mas os valores reais são obtidos a partir de fórmulas matemáticas que levam em conta o comprimento focal das lentes (quadro 1).
Simpler approaches of many authors indicate that the proportion of the depth of field have its values around 1 / 3 ahead of the subject and 2 / 3 behind the subject, but the precise values come from mathematical formulas that take into account the focal length of lenses (Table 1).
Simpler approaches of many authors indicate that the proportion of the depth of field have its values around 1 / 3 ahead of the subject and 2 / 3 behind the subject, but the precise values come from mathematical formulas that take into account the focal length of lenses (Table 1).
Quadro 1 – Distribuição da Profundidade de Campo
Table 1 - Distribution of Depth of Field
Photo made with f 2.8 (Note that the pink pencil is out of the field)
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