The bulk of ablaze captured by a lens is proportional to the breadth of the aperture, according to:
\mathrm{Area} = \pi \left({f \over 2N}\right)^2
Where f is focal breadth and N is the f-number.
The focal breadth bulk is not appropriate if comparing two lenses of the aforementioned focal length; a bulk of 1 can be acclimated instead, and the added factors can be alone as well, abrogation breadth admeasurement to the alternate aboveboard of the f-number N.
If two cameras of altered architecture sizes and focal lengths accept the aforementioned bend of view, and the aforementioned breach area, they accumulate the aforementioned bulk of ablaze from the scene. The about focal-plane illuminance, however, depends alone on the f-number N, absolute of the focal length, so is beneath in the camera with the beyond format, best focal length, and college f-number. This assumes both lenses accept identical transmissivity.
\mathrm{Area} = \pi \left({f \over 2N}\right)^2
Where f is focal breadth and N is the f-number.
The focal breadth bulk is not appropriate if comparing two lenses of the aforementioned focal length; a bulk of 1 can be acclimated instead, and the added factors can be alone as well, abrogation breadth admeasurement to the alternate aboveboard of the f-number N.
If two cameras of altered architecture sizes and focal lengths accept the aforementioned bend of view, and the aforementioned breach area, they accumulate the aforementioned bulk of ablaze from the scene. The about focal-plane illuminance, however, depends alone on the f-number N, absolute of the focal length, so is beneath in the camera with the beyond format, best focal length, and college f-number. This assumes both lenses accept identical transmissivity.
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