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(More customer reviews)The Kenko 25mm extension tube, for those who don't know, is in a nutshell just a tube that moves the lens away from the camera's sensor, enabling it to focus closer than it would be able to without, the caveat being that you can no longer focus to infinity, and depending on the focal length of the lens used, the total focus range may not be more than an inch total. So it's used mainly, if not exclusively, for macro shooting, for much cheaper than a dedicated macro lens.
Another warning about the tube: due to the way it works, any imperfections inherent in whichever lens you're using are magnified, but know that it's the same with all extension tubes and that's just how they work. In my own experience, shooting with a 50mm f/1.8 and the 28-135mm f/3.5-5.6, I have noticed no such imperfections.
Anyway, I just got mine in the mail today and have been shooting random macros of whatever I can find on my desk. It should be noted that if you plan on shooting in available inside lighting, a tripod is mandatory, since you should probably be stopping down for better quality macros. So I've been working with 20- to 30-second exposures at apertures of f/8 to 10. And so far I've been very pleased with the quality of the output images, and perplexed with the challenges this new area brings to my photographic experience. For instance, my 50mm f/1.8, pretty much the most widely owned lens in existence in my experience, now focuses between 6 and 8 inches where it used to focus between 1.5 ft and infinity, and the depth of field is much much shallower. This effect becomes less dramatic the longer the focal length of the lens is. And the instructions that come with the lens say it cannot be used at focal lengths of 24mm or shorter for this reason.
As far as autofocusing goes, I can't comment, because I've pretty much been manually focusing exclusively to ensure tack-sharp images, which are what I've been getting. I can't compare this tube to that of Canon, but I can't imagine Canon's version being any better than this one, since they're both glassless tubes. I hear they might differ in how they relay EXIF data to your camera, but for my own purposes this makes no difference.
In short, I've been very pleased with this purchase and strongly recommend this tube to anyone who wants to give macro shooting a try without breaking the bank.
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Kenko Uniplus Tube 25mm DG -Canon Auto FocusExtension 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 DG 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.
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