flash factor

flash factor

[′flash ‚fak·tər]
(optics)
In photography using a photoflash lamp, a number dependent on the lamp and the film speed, equal to the product of the distance of the lamp from the subject and the correct f-number for that distance.
References in periodicals archive ?
Adding to the flash factor is extensive use of clear-coated silver carbon fiber mat.
The hunt in the cupboard under the stairs for the sledge, and the joy of discovering when it can't be found anywhere that a tea tray is almost as good, even if it lacks the flash factor in the local park.