The Canon Speedlite 199A is an automatic electronic flash unit designed for AE photography with Canon A-1, AE-1 and AV-1 cameras. This Canon flash features a high guide number of 98 with ISO 100 film to give you greater reach or working distance for a flash. When set at AE, in case of A-1 or AE-1, this automatic electronic flash unit sets the shutter speed and f/stop. Thanks to a large light output, this Canon flash increases the scope of flash photography. The Canon Speedlite 199A is the most powerful shoe-mount Speedlite in the Canon line that simply illuminates your subjects.