ND filters are used to reduce exposure. Allows the use of larger apertures, reducing depth of field, to allow selective focus and rack focus.
Diopter filters help magnify your image. The amount of magnification you can achieve will be dependent on things like focal length and the close focus of the lens.
Great for cameras with CCD sensors without an integrated IR protection filter, because the IR sensitivity of the CCD sensor could cause color changes and unsharpness.
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