Supplied in sets of three tubes of different lengths, giving seven different extensions. The longer the extension, the greater the magnification. Calculate magnification by dividing the focal length of the lens into the extension being used. EG 100mm of extension with a 50mm lens will give 2:1, 50mm of extension on a 100mm lens will give 1:2. Wide angle lenses give greater magnifications than standard or telephoto lenses, but with the shortest working distances. Auto metering functions retained but most types are non auto focus.
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