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Close-up filters
Close-filters, also known as close-up lenses, attach to the front of a lens or lens adapter and extend the close-up range of a digital camera. Though not as high quality as a lens, close-up filters are small and lightweight. Close-up filters have diopter ratings such as +1, +2, +5, +7s and can be bought individually or in sets. They can be stacked to provide more magnification than if only one close-up filter was used.
If you stack filters, the order you do so is important. Always put the strongest filter closest to the camera lens, then the next strongest, etc. When using a standard filter and a close-up filter simultaneously, attach the close-ups first and the filter last.
When using close-up filters use as small an aperture as possilbe since there is less depth-of-field.
