Скачать или смотреть Depth of Field Tutorial Bangla UPDATE 2019

Depth of Field Tutorial Bangla .

What Is Depth of Field ?
How Dose it Work ?
Focal Length ?


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In optics, particularly as it relates to film and photography, depth of field (DOF), also called focus range or effective focus range, is the distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image. Although a lens can precisely focus at only one distance at a time, the decrease in sharpness is gradual on each side of the focused distance, so that within the DOF, the unsharpness is imperceptible under normal viewing conditions.

In some cases, it may be desirable to have the entire image sharp, and a large DOF is appropriate. In other cases, a small DOF may be more effective, emphasizing the subject while de-emphasizing the foreground and background. In cinematography, a large DOF is often called deep focus, and a small DOF is often called shallow focus.

For full-frame 35mm still photography, the circle of confusion is usually chosen to be about 1/30 mm. Because the human eye is capable of resolving a spot with diameter about 1/4 mm at 25 cm distance from the viewing eye, and the 35 mm negative needs about an 8X enlargement to make an 8x10 inch print, it is sometimes argued that the criterion should be about 1/32 mm on the 35mm negative, but 1/30 mm is close enough.[4]

For 6x6 cm format enlarged to 8x8 inches and viewed at 25 cm, the enlargement is 3.4X, hence the circle of confusion criterion is about 1/(3.4 x 4) = 0.07 mm.

Similarly, for subminiature photography (for example Tessina) with a frame format of 14x21mm, 8x12 inches corresponds to 14.5X enlargement, hence circle of confusion limit about 0.017 mm.

Many sources propose CoC limits as a fraction of the film format diagonal, typically 1/1000 in the early twentieth century to 1/1500 more recently. The three formats above at fraction 1/1500 would use 0.029 (about 1/32), 0.056, and 0.017 mm.[5]


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