![]() The difference between them being the lens as indicated in the image captions. ![]() Same lighting and exposure (1/200th f/16, ISO200), same subject, same Canon EOS 20D body. 70-200mm Lens + Extension Tube Macro Photography – 100mm Macro Lens Macro Photography – 70-200mm Lens + 20mm Extension Tube, Focal Length = 135mmĪll four of these images were taken under the same conditions. if you’re a wedding photographer trying to get the ring shot you could miss a crucial moment by having to fiddle around with your lenses). You’ll also save time by not having to worry about attaching and removing them (e.g. They will also focus all the way out to infinity so are a much more flexible option than extension tubes, if you have the budget. Macro lenses are designed to focus closer than a regular lens. If you don’t have a macro lens in your kit bag, the extension tube offers a cheaper alternative to buying a new lens. (BTW, don’t confuse an extension tube with an extender – they’re very different lens accessories) Extension Tubes vs. Moving the lens further away from the sensor plane increases the size of the projected image (Extremely simplified!)Īs the lens is moved further away from the plane of the sensor, the image it projects inside the camera is enlarged. Extension tubes work by increasing the separation between the camera body and the lens thereby magnifying the image. They don’t contain any optical elements so introduce significantly less image degradation. ( Click to Tweet)Īn extension tube on the other hand is just a cylinder filled with fresh air. ![]() ![]() I know what my lens can deliver and with a close-up filter I just don’t get the results I want.Įxtension tubes work by increasing the separation between the camera body and the lens thereby magnifying the subject. I did purchase a close-up filter that will fit a 77mm lens but every time I’ve used it I’m not, happy with the results. I’ve also invested in pro glass so I’m very reluctant to add anything that will degrade the image. Considerably larger than in my film days. With the lenses I use now, the diameter of the front element is 77mm. I made some great images too but there is one major drawback with them: they introduce another optical element and that will degrade image quality, no matter how good it is. In the early days of my photographic career I always used a close-up filter for my macro photography. Close-up Filters for Macro PhotographyĪ close-up filter is basically a magnifying glass that’s been adapted to attach to the front of the lens, either by screwing directly into the filter thread or via a holder system. Metal extension tubes are more robust and also cost more too. Make sure you buy the ones with the correct mount for your camera and that they have the electrical contacts to pass data between the lens and camera. Extension Tubes for Macro PhotographyĮxtension tubes can be bought individually or as a set, usually of three such as these Kenko tubes (12mm, 20mm and 36mm). In extreme cases it can bring infinity so close the lens won’t focus beyond it’s front element. The disadvantage of using an extension tube is that, when fitted, it reduces the maximum focusing distance of the lens from infinity to less than a metre or so. The longer the tube, the greater the magnification. The tube fits between the camera body and the lens, moving the lens further away from the film/sensor plane, effectively magnifying the image from the lens. The other end replicates the camera interface and is where the lens mounts. One end of the extension tube fits on the camera body where the lens would attach. They’re short tubes, usually in the region of 5mm to 25mm in length, with a lens mount at either end. Here’s why… Extension Tubes – What are they…?Įxtension tubes are very simple devices. In the early days of my photographic career my weapon of choice for macro work was a close-up filter.
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