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Extension tubes are sometimes confused with teleconverters, an optical component (i.e., containing lenses) designed to increase effective focal length. A close-up lens also enables focusing closer for macro photography but, unlike an extension tube, a close-up lens actually is an optical element.
Extension tube #1 - 11.8mm [14] Extension tube #2 - 23.6mm [14] Extension tube #3, Extension tube #3S - 35.4mm [14] Auto macro spacer 2x - when used with 80mm f/4 Macro lens, increases magnification from 1:2 to 1:1 [14] Auto bellows [14] Balloon bellows [14] Slide copier attachment and slide carriers [14] Focus handle (attaches to lens) [14]
That distance is sometimes given on the filter in millimeters. A +3 close-up lens has a maximal working distance of 0.333 m or 333 mm. The magnification is the focal distance of the objective lens (f) divided by the focal distance of the close-up lens; i.e., the focal distance of the objective lens (in meters) multiplied by the diopter value (D) of the close-up lens:
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Many macro lenses are characterised by a high amount of chromatic aberration, especially when using reversed-lens, extension tube or close-up lens. Some macro lenses, called apochromatic lenses , are designed to better control this, such as the Laowa 100mm f/2.8 2x Ultra Macro APO and the Sigma APO MACRO 150mm F2.8.
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