Zoom working. Electronic – 10.
Vivitar 285 Zoom Thyristor professional camera flash + case
Vintage Vivitar 3500 Zoom Thyristor Flash Kit for Canon Boxed with DM/C Module
Vintage Vivitar 2500 Zoom Thyristor Camera Flash
Vivitar Zoom Thyristor 285 Mount Flash with Wide Angle Diffuser
Vivitar Zoom Thyristor 285 Vari Power, Tested and Working - Please Read
Nikon Speedlight SB-15, Vivitar Zoom Thyristor 3500, Sunpak Auto 28 SR Thyristor
