The Vivitar Model 283 Auto Thyristor is a legendary electronic flash unit first introduced in 1972. Often called "The Workhorse," it became a staple for professional photojournalists and wedding photographers due to its reliability, high power, and extensive accessory system. It remained in production for nearly 30 years and sold over 3 million units in its first three years alone. Key Features: · Auto Thyristor Technology : Allows for faster recycling times and efficient battery usage, with four colour-coded automatic modes (yellow, orange, blue, purple) for different distance ranges and depth-of-field control. · Versatility : Features a tilting head (0° to 90° for bounce flash) · Calculator Dial: An illuminated dial helps manually determine the correct aperture based on film speed and subject distance. · ...