The Pre-Owned - Commander Optics Bounce/Swivel Flash TTL-613C is a versatile on-camera flash that offers TTL metering for accurate exposure in a variety of shooting situations. This flash unit features a bounce and swivel head for creative lighting effects, allowing you to control the direction and intensity of the light. With a guide number of 61 meters at ISO 100, this flash provides powerful illumination for both indoor and outdoor photography. The Commander Optics TTL-613C is compatible with Canon cameras and is a cost-effective option for photographers looking to expand their lighting capabilities.