![]() ![]() Instead it’s something you need to carry in your bag and use when it makes sense to do so. It’s for this reason that you should generally not leave an extension tube in place all the time. ![]() This has few practical implications because most people are using extension tubes to try to focus on something at a very close distance, but it’s worth knowing so that you don’t think your lens is broken when you find it’s no longer able to focus on something further than a few feet away. Later in the article I will discuss the knock-on image quality issues caused by extension tubes, but the other important thing to realise is that when extension tubes are in place, you can no longer focus all the way to infinity. What all this means is that you can turn a normal lens into something with much a much higher magnification factor to achieve macro-like images, without needing a dedicated macro lens. The thicker the extension tube used on a lens, the higher the lens magnification becomes as you’re able to move the lens much closer to the subject and still achieve focus. If a subject is closer to the sensor than a lens’ MFD, you cannot focus on that subject. ![]() The MFD of a lens is a measurement of the closest point a subject can be from the camera’s sensor, whilst still being able to focus. Extension tubes can turn any lens into a macro lens.Īn extension tube is a spacer that sits between your lens and the camera body to alter the MFD (minimum focus distance). ![]()
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