ELECTRONIC DEVICE, ILLUMINATION DEVICE, AND ITS ELECTRIC AMOUNT CALCULATION METHOD

摘要

A fully charged battery or an unused battery is set in a battery box of a lighting apparatus. A user turns on an illumination electric source of the apparatus and selects the battery set in the battery box. A maximum number of lighting times Smax when the lighting apparatus causes manual full lighting M1/1 by using the selected battery is stored in a memory of a microcomputer or IC by a user according to an operating button or an instruction on a liquid crystal screen. Next, the user performs normal shooting. A lighting amount (TTL lighting, manual full lighting, or the like) when the user performs shooting is converted to manual full lighting M1/1 to be obtained as a number of lighting times. By comparing the obtained number of lighting times with the maximum number of lighting times Smax, how many times of lighting can still be performed at a maximum is calculated.