These lenses are clip-on style, which is preferable to the stick-on type. They are not professional quality lenses, but for the price they are acceptable. My wife wanted a macro, and that one works well. The fisheye would not focus on her phone, but worked okay on my daughter's phone. These are nice little lenses for occasional use. If you're looking for exceptional quality, use a good camera with proper lenses.
Sigma lenses have proven to be excellent choices for me since my first (of now 4) lense. Pleasing photograph results has netted my confidence and trust in the name. Certainly a bargain investment in my unprofessional opinion.
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