Ron, the only wide angle auxiliary adapter lens that I have any knowledge of is the marexar UltraWider. I have one. It is designed for use with a 50mm lens on a 35mm film camera, giving a focal length of about 28mm. If I attach it to the front of my Nikkon 18-55mm lens, it only works at the long end. If I zoom to around 35mm it vignettes badly. I think that all wide angle auxiliary converter lenses work this way. You may, however, find a fish-eye adapter that will work, but the image quality is likely to be very poor.
“It ain’t what you don’t know that gets you into trouble. It’s what you know for sure that just ain’t so.” Mark Twain