Assistant focusing method by using pre flashing of flash lamp
A technology for assisting focus and flash, applied in optics, focusing devices, instruments, etc., can solve the problems of time-consuming focus adjustment, waste of power, poor focus effect, etc., and achieve the effect of improving accuracy and increasing costs.
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[0019] In the method of the present invention utilizing flashlight preflash to assist focusing, Y 0 Preferably less than a brightness lower limit value Y L . In the method for assisting focus by using flash pre-flash in the present invention, the first energy is preferably not equal to the second energy. In the method of the present invention utilizing flashlight preflash to assist focusing, Y 0 The subject distance D corresponding to ΔY is preferably obtained by looking up a conversion table or estimating from an equation. More preferably, the above conversion table or equation is obtained from pre-collected experimental data. In the method of the present invention utilizing flashlight preflash to assist focusing, it is preferable to use Y 0 , ΔY, and reflectance R to calculate the distance D of the subject. More preferably, Y 0 , ΔY, and the relationship between the reflectance R and the distance D of the subject are obtained from pre-collected experimental data. Wher...
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