This flash is missing a small cover on the front knob.
Function
Fully Functional
Warranty
Six months - used equipment that tests to specs
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The Vivitar 283 Auto Thyristor is a classic, all-purpose flash for older mechanical film cameras. The 283 has a bounce head, built-in sensor capable of automatic exposure modes and a guide number of 64 at ISO 100. It uses four AA batteries.
This flash should not be used with any modern electronic camera due to potentially damaging voltage output.