The Vivitar 2000 flash has a guide number of 60. It has 1 auto option or full power manual. The auto is f4 for ASA 100 film. Comes with a built-in sync cord for off-camera use, so it can be used as a main flash or a fill flash. Chart on back gives the recommended f-stop based on distance when using just this flash at full power, but it's designed to be usable as a fill flash with another main flash unit. Used properly, multiple light sources give much better results than any single light source.
The flash is used and in excellent condion. Other than minor battery corrosion, which has been cleaned, it looks almost new. If it wasn't for the corrosion, it would be an easy A. Takes 4 AA bateries which are not included.
Condition - B