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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.
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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The Macro Converters are a set of two extension tubes which fit between the optic and the mechanical body. One tube is 8mm, and the other tube is 16mm; they may be stacked together to make a 24mm tube.
The Nikon Amusing Lenses (ニコン おもしろレンズ工房) are a limited production set of four toy lenses for the Nikon F mount sold exclusively in Japan. The Amusing Lenses were designed by Kouichi Ohshita and introduced in 1995, then discontinued in 1996; they were re-released in 2000 as the Fun Fun LensSet , which was discontinued ...
All Nikon zoom AF-lenses have focal length encoders added. Nikon AF-P: The lens contains a pulse motor (utilizing stepping motors) to focus smoother and quieter than previous drive systems. Nikon AF-I, Sigma/Tamron/Tokina: no designation: The lens contains an integrated focus electric motor. The Nikon type was produced from 1992 to 1996 and is ...
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