Vivitar 550FD Auto Thyristor flash gun. Auto & manual modes ISO / distance settings Standard hot shoe mount
Vintage Vivitar 2800 Auto Thyristor… Not tested.
Two Vivitar 255 Auto Thyristor Flash Guns.
Vivitar 550FD Auto Thyristor Shoe Mount Flash - Very Good Condition
Vivitar 283 Auto Thyristor Vintage Camera Flash Unit (from the 1970s)
Vivitar 550FD Auto Thyristor Shoe Mount Flash Gun Minolta Pentax - For Repair
Vivitar 2800 Auto Thyristor Electronic Flash unboxed
