Many old flashes (such as the Vivitar 283) have high trigger voltages, and if you connect them to your camera, may damage the camera electronics. For off-camera flash where the flash is not physically connected to the camera, this isn't a problem.
Vivitar DF-372 TTL Flash | Nikon i-TTL / Canon E-TTL / E-TTL II
Guide #: 177' at ISO 100 and 180mm
Zoom Range: 18-180mm
Vivitar DF 383 Compatible with Canon E-TTL / E-TTL II Guide Number: 148' at ISO 100 and 85mm Zoom Range: 24-85mm Tilts Upward 90°
Shop for the Vivitar Flash Lighting Solutions here
Flash Lighting Solutions
Reviewed by Gene Wright on