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2. Extension tube - Wikipedia

   en.wikipedia.org/wiki/Extension_tube

   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.

3. Macro photography - Wikipedia

   en.wikipedia.org/wiki/Macro_photography

   Extending the distance between the lens and the film or sensor, by inserting either extension tubes or a continuously adjustable bellows, is another equipment option for macro photography. The further the lens is from the film or sensor, the closer the focusing distance, the greater the magnification, and the darker the image given the same ...

4. Percutaneous endoscopic gastrostomy - Wikipedia

   en.wikipedia.org/wiki/Percutaneous_endoscopic...

   PEG tubes may also be extended into the small intestine by passing a jejunal extension tube (PEG-J tube) through the PEG tube and into the jejunum via the pylorus. [ 1 ] PEG administration of enteral feeds is the most commonly used method of nutritional support for patients in the community.

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7. Extension tubes - Wikipedia

   en.wikipedia.org/?title=Extension_tubes&redirect=no

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