- Focal length in digital cameras

The focal length of the cameras of roll, 35 mm, they have a rectangular format of 24 x 36 mm, complete picture (full frame) and the focal length of the normal lens is in the habit of being in millimeters, equally or minimally major that the value of the diagonal of the format, 50 mm. (Diagonal = 43.27mm) to avoid aberraciónes chromatic and spherical of the lenses. There are in the habit of being professional digital chambers of different format, this is, that the dimensions of the sensor are not standard as in case of the chambers 35mm. There are sensors full frame, 24x36mm (Diagonal: 43.27 mm) normal L.F of 50mm. Sensors 4/3, 17.3 x 13mm. (Diagonal: 22.5) for that there will correspond a lens of 25 mm as normal L.F.. The sensors 2/3, 8.80 x 6.60 mm (Diagonal: 11 mm) for that there will correspond a lens of 12 mm as normal F.L.