A floppy disk is a lot like a cassette tape: Both use a thin plastic base material coated with iron oxide. This oxide is a ferromagnetic material, meaning that if you expose it to a magnetic field it is permanently magnetized by the field.
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The 55-250, while not outstanding, performs comparably to the more expensive EF 70-300mm f/4-5.6 IS USM in terms of optics. The difference between full frame and APS-C sensors. Although the focal length of a lens is the same regardless of the sensor size, the Field of View (FoV) obtained will be different.