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Forum: Photographic Technique
11-03-2009, 11:21 AM
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An extension tube is an empty tube that moves the lens further from the camera. The further from the camera, the closer the lens focuses (check out what your focus ring does - it moves the lens away from the camera). My 100/4 M series macro lens has 50mm of extension built in, so it focuses to 1/2 life size. I have a 50mm tube, and when it is between the lens and the camera, my magnification varies between 1/2 life size on the sensor/film to life size. I have changed the focusing threads to change between 50 and 100mm of extension. Buy a tube with the electrical contacts to maintain all the camera's connections with the lens. I understand the Kenko tubes are quite good. My tube is ancient. I bought it to allow the 400 to focus closer.
When you export your pictures to the forum, make sure you set the colour space to sRGB, not ProPhoto or Adobe RBG.
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