SLR flash parameters

There are two kinds of flash lamps for SLR cameras: one is the one that comes with the fuselage; One is plug-in. The greater the flash index, the greater the effective lighting distance and range. The general index of the fuselage is about 12, and the effective range is about 4 meters when the focal length is about 35 mm; Generally, the minimum flashover index is 18, and the effective range can reach about 6 meters when the focal length is 35 mm, and the larger the flashover index, the more expensive it is. If household appliances are generally equipped with an index of 24, the original flashlights are more expensive, such as Canon/Nikon lamps, which are cheaper 1500 yuan. Domestic lamps are much cheaper, such as those in Yin Yan, with a price of one or two hundred yuan, and the supporting models are relatively complete.