Yongnuo YN-24EX TTL Macro Flash for Canon Cameras, that uses a dual flash head design that is mounted to the front of your lens, providing excellent control over the position of the light and how it will light the subject. This system provides coverage of 90° with the ability to rotate the adapter ring 50° upwards and 30° downwards as well. These heads also feature excellent power with a guide number of 85′ at ISO 100 for a single head or 79′ at ISO 100 when both flash heads are in use.
While TTL is supported, full manual control is available from 1/1 to 1/128 power. For additional help, an LED autofocus assist light is present on the YN-24EX and users have access to both 1st and 2nd curtain sync. For working with other systems, a PC sync port is available, and the flash runs off four AA batteries or a HV power pack, both of which offer a recycle time of three seconds at maximum power. Additionally, it comes with 52, 58, 67, and 72mm adapter rings.