High Definition 0.45x Digital Wide Angle Macro Lens 52mm for Canon Dslr

It says fits 52mm which it does with the macro on the fisheye, but said fisheye can be used without macro, except the fisheye by itself is not 52mm, so it will not work for me for what I wanted. I wish the ad was more clear on this. I have no clue what size thread the fisheye alone is. If you buy it better only be to use fisheye with macro on 52mm.

great lens