If you’d like to use your cellbot’s camera to get a good look at what is around the cellbot, you may have noticed that most cellphone cameras have a very narrow field of view, with only about 50 degrees of visibility. Especially in indoor situations, this is simply too narrow of a field to really let you see. Here is an example using a Toda-Seiko 0.5x magnification wide-angle lens:

You can see the field of view has pretty much doubled. Toda Seiko also makes an even wider-angle lens and a fisheye lens that I have not tried yet — the fisheye lens claims to give a full 180 degree field of view! All of these lenses mount via self-adhesive magnetic rings that you attach around your phone’s camera, allowing the lens to be attached/removed with ease. Note, however, that if your phone features a protruding lens or doesn’t have a flat surface around your lens, the magnetic ring might not attach well.



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