Its maximum aperture is dependent on the host lens, and its focal length can also vary based on the lens being used.
Vivitar MC Teleconverter 2x-5 (Box3) JL26
VINTAGE AUTO TELECONVERTER MC 2X OM JESSOPS
Vintage Vivitar MC Tele Converter 2X-21 Len`s Made In Japan
VIVITAR MC TELE CONVERTER 2X-3 LENS MADE IN JAPAN - CAMERA ASSESORY
Vivitar MC Tele Converter 2x-21 With Case
Vivitar MC 28-70mm 3.5-4.8 Macro Zoom - Minolta MD - Vintage - Good Condition
