Optic Magnifier Presser Foot For Janome It has good clear optics, which are plastic so I keep each in a separate plastic bag to prevent scratches. You must have a machine with the fitting to attach it. Once on the machine you can swing it out of the way when not needed. A simple clip allows you to change to a different power. The powers of 20, 40 and 60 provide a good range to select from. I usually use 40 power and switch to 60 for really close, careful work.