Supplementary lens

Supplementary lens
Another name for a close-up lens.
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SUPPLEMENTARY LENSES
Supplementary lenses are clamped on the front of the Nikonos lens. Their strength is measured in diopters (for example - 1, 2 or 3 diopters as the lenses increase in strength).

Supplementary lens
additional elements that can be placed over a prime lens to alter focal length and angle of view
Super macro ...

Supplementary Lens.

Generally a simple positive (converging) lens used in front of the camera lens to enable it to focus at close range.

Supplementary lenses - additional lens elements used with the standard camera lens to provide a new focal length.
Surface development - development process in which the image forms primarily on the surface of the emulsion and then penetrates deeper.

Converter
A supplementary lens that can double the length of a telephoto lens (e.g.: 2x converter). Usually fitted between lens and camera body.

The heart of the system was a series of supplementary lenses that could be removed and replaced under water.

Close-up (stills)
A shot requiring a supplementary lens, bellows, extension tubes, or macro lens to bring the subject into focus.

It can be extension tubes, bellows, or supplementary lenses.
Coated lens: A lens with coated surface such as magnesium fluoride to reduce flare.

A camera store could never sell you a "magnifying glass" for $50 so they call these things "supplementary lenses" or "close-up lenses". Good things about close-up lenses: ...

See also: Lens, Supplementary, Photograph, Camera, Light