This humble aluminium tube has opened up a whole new photographic world, the world of the macro.
Extension tubes provide an attractive way of adding a Macro capability to their camera set up. Extension tubes are available for almost every SLR body, can be attached to different lenses for different effects, and are much, much less expensive than dedicated macro lenses
Works with most lenses, except for those with very short focal lengths.
AF (auto focus) will not work, because no electrical contacts
3 different length, stackable tubes for various configuration/macro level
Made of anodized aluminium, almost no reflection, light and compact.
Useful even with telephoto lenses. A long lens is great for making things bigger, but they cannot focus very close at all. An extension tube can allow you to enlarge with the telephoto but still maintain a good working distance.
Installs between the lens and the DSLR/SLR body.
All lenses have a limit to how close they can focus. A typical lens, for example, may not be able to focus on anything closer than 30cm. This is because as objects move closer to the lens, the focal point moves further back, eventually beyond the plane of the film or sensor. An obvious way around this problem is to move the lens further away from the camera. That is what macro extension tubes do.
The macro extension tubes it comes in five sections. At each end is a bayonet ring for mounting the tube to the lens and camera body. In between those any combination of three threaded tubes of varying length can be used to change the extension by varying degrees.
You may have noticed that the longer the lens, the lesser amount of magnification the extension tube gets you. This is because of how an extension tube works. Every lens has a minimum focus distance as part of it's characteristics, for example my 50mm lens has a minimum focus distance of 1.5ft, the 85mm - 2.8ft and the 100-300 - 4.9ft. (In general, the longer the focal length of the lens the greater the minimum focal distance.) An extension tube radically reduces that minimum focal distance. In fact it creates a focus zone, a fairly narrow focus zone, within which an object may be in focus. For example on the 50mm lens the minimum focus distance is reduced down to about 4 inches and the depth of field becomes so narrow that you'd best be pretty close to that distance when you attempt to focus the shot.
This fact is why the 25mm extension tube won't work with anything shorter than a 35mm lens because the focus zone is moved in so close the front glass element on the lens prevents you from getting that close.
Depth of Field (DOF)
Also, as you get closer to the focus object the Depth of Field (DOF) gets very narrow (see DOF tip). This requires some very precise work to get your entire subject in focus with the extension tube mounted on the shorter focal length lenses. But increasing the f stop will increase the DOF just as always.
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