Kenko Auto Extension Tube Set, 10mm & 16mm Tubes Kenko Extension Tubes are an attractive way to convert your standard lens into a macro lens.Kenko Extension Tubes are void of optics. Their purpose is to move the lens farther from the the image sensor. The further the distance - the bigger the magnification becomes. Macro lenses are usually more expensive than standard lenses. By attaching it between the camera and the lens, Extension Tube will change your lens into macro lens without large investments in additional optical equipment. You can get close up images that aren't possible with a standard lens by itself. The DG extension tubes have no optics. They are mounted in between the camera body and lens to create more distance between the lens and the sensor or film plane. Moving the lens father away from the camera's sensor forces it to focus much closer than normal. The greater the length of the extension tube, the closer the lens can focus. Features: Fully Automatic Aperture Coupling Canon RF Mount Compatibility Compatible With: Cameras: Canon RF Mount cameras Product SKU: A-EXTUBEDG-CRF In The Box: Kenko Auto Extension Tube Set, 10mm & 16mm Tubes for Nikon Z MountLimited 1-Year Manufacturer Warranty Notes: When an extension tube is used the lens focuses much closer than its normal close-focus distance. However, the lens focus range will be limited to a close focus distance while the extension tube is being used. During use the lens will not be able to focus to infinity. When you take the extension tube off and mount the lens back on the camera the lens will focus to infinity again. As the focal length of the lens increases the effect of the extension tube decreases. A 20MM extension tube when used with a 50MM lens will allow it to focus incredibly close, maybe to just a couple inches from the subject. The same 20MM extension tube when used on a 200MM lens will only reduce the minimum focus distance by a small amount, maybe only a few inches closer than without it. To use extension tubes with telephoto lenses be prepared to use the 36MM tube or a combination of the tubes together. There is effective light fall off as light travels the length of the tube. A 12MM extension tube has an effective 2/3 light reduction,. The 20MM extension tube has a 1 stop light reduction and the 36mm has a 2 stop light reduction. This reduction will be calculated by your camera’s meter automatically so if you are using automatic settings no adjustment are needed. Light metering will be accurate. For best results, Kenko Tokina USA, Inc. recommends using a tripod for any macro photography.
