Can the flash of the old film camera be used in digital SLR?

Yes, but the old flash can be divided into low voltage and high voltage. If it is high voltage, it will be more troublesome for digital cameras and there is a danger of breakdown.

The comments of two people upstairs will mislead users. The reason why the flash of the old camera adopts high voltage circuit is because the trigger mechanism of the old camera is metal contact, so there is no breakdown problem. The trigger of the flash is to provide a short circuit for the flash contact. Inside the flash, a resistor is connected in series with a small capacitor, and the small capacitor is connected with the energy storage capacitor. One side of the capacitor is connected with a small transformer. When the trigger circuit is turned on, the charge in the capacitor flows through the transformer, and the instantaneous high voltage is induced in the secondary, which is used to breakdown the xenon lamp, and then the energy storage capacitor provides discharge current for the xenon lamp, forming a strong arc.

The so-called high-voltage circuit means that the flash trigger point is directly connected to the trigger capacitor. Before triggering, the voltage on the capacitor is equal to the voltage of the storage capacitor. According to the charging situation and the flash index, this voltage can reach 150~250V ~ 250 V, but because the capacity of the trigger capacitor is very small, it will be short-circuited immediately, and the power borne by the trigger point is also very small.

Low-voltage circuit, that is, using substitution method. The trigger point first drives a thyristor, and then the thyristor drives the trigger capacitor. Because of isolation, the voltage at the low-voltage trigger terminal generally does not exceed 3V.

Therefore, it can be seen that the high-voltage trigger flash is a disaster for the trigger point of the current semiconductor-controlled digital camera. Although the theoretical withstand voltage of the trigger point inside the digital camera can reach 200~300V V, if you have the courage, you can try to install the high-voltage flash, but you should know that the money for repairing the digital camera can make you buy a better flash.

Yin Yan BY 18 and BY24ZP are both high-voltage lamps, which can be obtained by measuring the contact voltage after being fully charged.

At present, the original Canon and Nikon flashlights are low-voltage lamps.

At present, there are no imported high-voltage flashlights, only some domestic flashlights, such as Yin Yan and others. Whether it is high voltage or low voltage, the general seller will indicate it when selling.