Kenko Extension Tubes are an attractive way to convert your standard lens into 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 will get close up images, those ones you can not shoot with standard lens only.
|Sony E Mount
This set of (2) extension tubes is compatible with Sony full frame mirrorless E-Mount cameras. For Sony Alpha Mount compatible tubes, please click here.
1. 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.
2. 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.
3. 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.
4. For best results, Kenko Tokina USA, Inc. recommends using a tripod for any macro photography.