Extension tubes are designed to enable a lens to focus closer than its normal set minimum focusing distance. Getting closer has the effect of magnifying your subject (making it appear larger in the viewfinder and in your pictures). They are exceptionally useful for macro photography, enabling you to convert almost any lens into a macro lens at a fraction of the cost while maintaining its original optical quality.The extension tubes have no optics. They are mounted in between the camera body and lens to create more distance between the lens and film plane. By moving the lens father away from the film or CCD sensor in the camera, the lens is forced to focus much closer than normal. The greater the length of the extension tube, the closer the lens can focus.The Kenko Auto Extension Tube Set contains three tubes of different length, a 12 mm, 20 mm, and 36 mm, which can be used individually or in any combination to obtain the desired magnification.Kenko’s Auto Focus extension tubes are designed with all the circuitry and mechanical coupling to maintain auto focus and TTL auto exposure.
Technical Details:
Designed to enable a lens to focus closer than its normal set
Very Useful for Macro Photography
The Extension Tubes have no optics
Focus Closer to the objects you see and enjoy the feel of photography
Auto Extension Tube Set for the Nikon AF Mount
Customer feedback:
1. Another essential tool for the photographers bag. AF and metering worked well with Nikon D70. Takes a bit of practice, but it makes you a better photographer. Like having a prime 50mm. You’ll find yourself (tripod) moving instead of zooming. Makes photgraphing macros challenging and very fun. Amazing shots. Tripod is almost manditory.
Wish the build quality was a little better. Extensions are plastic (& aluminum) and feel flimsy. Mounted a 70-300mm with all three extension, noticed bowing on the outside, but pictures were fine. Didn’t trust it, had to have a hand on the lens. Feels fragile with with all three mounted. Still works perfect though.
2. Use of any of these tubes on a lens with a focal length of less than 55mm (on a digital camera with an APS-C sensor, 1.5x crop) will result in a focusing distance so close you would only be able to photograph the individual stamen. For example, with the 36mm tube on a 50mm lens, I could capture a human hair from a few inches away. Even the 12mm on a 50mm lens results in an exceptionally close focusing distance (eg, photographing a small nail). However, with the 12mm tube on an 85mm lens, I can capture a flower at about 18 inches away.
