Wide Converter Lens

Wide Converter Lens
There is a wide-angle converter (auxiliary lens) that could use 18mm and bullet?

I have a 18-70mm lens and want to know if there is an auxiliary lens that could use him and not a 18mm bullet? will be no bullet or a 18mm? I have a Opteka 0.35x and I have to use it at about 29 mm so that no bullet (Although it doesn't fit my goal without an adapter, i bought accedently 52 mm instead of 55mm thread)

Most add-type filter adapters wide angle were performed in the Film Camera era, so are not configured for use with smaller sensors on most digital SLRs. These filters were not intended to be a "professional" solution and more of a gimmick in general. The reason they are finding can only be used in 29 mm without Vignetting is that this was the larger goal of most people of means could afford the old film SLR, so the filters were designed working with focal lengths is not greater than 28 mm. I've never heard of an adapter that was designed to be used with any lens wider than 28 mm

DIY Mattebox/Lens hood for Canon WD-H37C 0.7 x Wide converter and HF10