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Kenko DG Auto Extension Tube Set for the Canon EOS AF Mount. | 
| Brand: Kenko
Category: Photography
Buy New: $167.89
as of 9/6/2010 07:58 CDT details
New (6) Used (2) from $150.00
Seller: Cameta Camera
Rating:  44 reviews
Media: Accessory
Batteries Included: No
Shipping Weight (lbs): 0.6
Dimensions (in): 3.7 x 2.8 x 2.8
MPN: KE-NAHDAFF
Model: KE-NAHDAFF
ASIN: B000U8Y88M
Availability: Usually ships in 1-2 business days
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| Features:
| • | Extension tubes are designed to enable a lens to focus closer than its normal set minimum focusing distance. | | • | The DG extension tubes have no optics. | | • | Contains three tubes of different length, a 12 mm, 20 mm, and 36 mm | | • | Designed with all the circuitry and mechanical coupling to maintain auto focus and TTL auto exposure with most Canon, Nikon, and Minolta lenses |
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Product Description
Kenko DG Teleplus Extension Tube Set
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 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.
The KENKO DG 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 also makes a DG UNITUBE 12 mm or 25 mm which can be purchased individually.
Kenko's Auto Focus extension tubes are designed with all the circuitry and mechanical coupling to maintain auto focus and TTL auto exposure with most Canon, Nikon, and Minolta lenses given there is enough light to activate the cameras AF system properly.
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| Customer Reviews:
Showing reviews 1-5 of 44
 Great Tubes - But Know What You're Getting! April 13, 2009
Jeff Kraus (Orlando, FL USA)
278 out of 279 found this review helpful
I've had these for a few years now. They're built really well, and in all this time they have developed absolutely no signs of wear.
Tubes are really pretty basic in construction. There are no glass elements, just mounts on each end and a pass-through for the lens data terminals. These are well-built, and as such they fulfill their intended purpose - that being that you now have an easy, less messy alternative to taping a cardboard toilet paper tube between your lens and camera body (and yes, you can do that if you want to go the low-tech route. Just make sure you seal the light leaks!) Any other issues are likely to be caused by a misunderstanding of the tube's purpose, not by the tube itself.
There seems to be a lot of confusion regarding extension tubes, based on some of the reviews I've read. While it would be difficult, without diagrams, to explain exactly how an extension tube works and the effect it has on focus distance and magnification, I can at least try to help with some of the problems people seem to be experiencing in these reviews.
1) There are two distinct versions of these tubes. On the 36mm tube, you will see either "for C/AF" or "for C/AFs". The ones that say "for C/AF" do not support the Canon EF-S mount. They support only the EF mount. If any of your lenses are EF-S, then you will need the ones that say "for C/AFs". Functionally, they are equivalent, but the "C/AFs" models can mount both types of lenses. As of now, it is impossible for me to tell which version is being sold here. I have to assume that they are selling the "C/AFs" model.
2) Extension tubes do not "magnify", technically. They increase the distance between the lens and the sensor. Imagine a projector sitting a foot from the wall, projecting an image on that wall. Using a pen, you outline the outer edge of that projected image on the wall. That's the outline of your "sensor". The image fills the "sensor". Now add more distance between the projector and the wall (that's what an extension tube does). It's the same image, but now it's projected onto a larger surface, flowing over the boundaries of the "sensor". So now the "sensor" only records the part of the image in the very center, just enlarged due to the added distance from the projector.
3) Moving the lens farther away from the sensor alters the usable focus distance for that lens. Don't take these numbers as truth (it's just an example), but a lens that normally focuses from 3ft to infinity might focus from 6 inches to 2 feet, once the extension tube is put on. How drastic the change is depends on the length of the tube and the focal length of the lens (See the next point).
4) The lens focal length has a huge impact on the focus range, but not necessarily in the direction you'd think. Longer lenses (like 200mm or 300mm) won't see as much difference in focal range with the smaller tubes. While there is a difference, you still won't be able to get close enough to really improve the magnification significantly. Wider lenses show a more drastic change. I have used my shortest tube (least "magnification") on my 17-40mm f/4L. Even though it's the shortest tube, when zoomed out to 17mm, the camera will actually only focus INSIDE THE LENS. Meaning even if I lay a dime on the glass of my lens, it's still not close enough to be in focus. That's why so many people like to use their tubes with a 50mm f/1.8. It's a nice medium-length lens that can allow really close focus while still being usable.
5) There's no such thing as a free lunch! Remember the projector reference in #2? Well, just like the tubes, the farther that projector gets from the wall, the darker the projection will be due to light falloff. Meaning you will lose light when you use tubes. The amount you lose increases exponentially with the added distance from the sensor. So in many cases you will need to mount on a tripod or use external lighting. Also, any imperfections in the lens (aberrations, fringing, etc) will be effectively "magnified" just as much as the image itself. And the lens resolution limits will also be made much more obvious since the sensor will be recording a smaller section of the overall image circle provided by the lens. However, it's important to note that the benefits usually will outweigh the drawbacks, especially when the tubes are used within reason (i.e. I wouldn't do resolution-critical photos with all three tubes stacked together).
Hopefully this information is useful to someone. If I said anything confusing or if you see any mistakes, please let me know and I'll be happy to make adjustments/corrections/clarifications as necessary. But as far as the product itself goes, these are excellent, solid extension tubes with a great fit, no light leaks, and a nice light weight.
Excellent build quality! April 5, 2008
Brandon
14 out of 14 found this review helpful
I was initially hesitant to purchase this simply because I had already made my own extension tube out of PVC pipe, a body cap, and a lens rear cap. Obviously, the one I made has some drawbacks (No autofocus, had to reset the aperture manually before attaching everything) but the question that kept occurring to me was whether or not these Kenko tubes were really worth the price, considering what a simple thing they are doing. The truth is, I'm still very glad I bought them. As simple as they are, you just aren't going to be able to reproduce the same functionality and build quality yourself for less money, and if you can then stop reading this and go do that. For the other 99% of us, these tubes are wonderful.
-Turn any lens into a macro lens. Get as close or as far away as you want, using the 7 effectively different combinations of the three tubes.
-Change aperture settings on the fly as you normally would do!
-Maintains the ability to autofocus in all but the most extreme macro situations.
-Great build quality! Even with all three tubes in use, the mount is very stable and holds very firm. I anticipated some play in them but cannot feel any wobble at all.
A great investment to make, since you will be able to use them in combination with ANY EF lens you have or will have in the future.
Check the image section for a couple images I took with my these tubes and my Canon 50mm EF prime 1.4f lens.
Just What You Need to Get Really, Really Close June 8, 2009
John Guilbault
11 out of 11 found this review helpful
I've been reading over some of the negative reviews on these Kenko Extension Tubes, and I think some people have the wrong idea about what these things do. They get you closer to your subject...that's all. They don't magnify the telephoto end of your lens, like a 1.4x or 2.0x teleconverter would. They just allow you to get closer, so your subject is bigger in the lens. What you give up for this is the ability to focus farther away. Plus your depth of field, even at f/16 or f/22, is going to be measured in fractions of an inch, not feet or yards. You also lose light, about 2 or 3 stops depending on how many tubes you use. What you retain is image quality, which in my opinion is the most important thing.
Kenko has made a nice product here. These tubes are well-built and fit snugly on my camera. When I used my 70-200mm f/4 L, I noticed no sag or play at all. All electronic functions worked as they should, including aperture and auto-focus. Don't expect auto-focus to work as quickly as normal, though, and I believe most people would find it easier to just use manual focus. That's normal with any extension tubes.
If you understand how extension tubes work, you won't be disappointed with these Kenkos.
A great option December 28, 2007
PrOxY (SoCal)
16 out of 18 found this review helpful
I picked these up for the times I want to shoot in Micro. It's not something I do often, so buying specific glass for that wasnt something I wanted to do. I have used them on with my Canon EF 28-70mm f/2.8"L" USM,
Canon EF 70-200mm f/2.8"L" IS USM & Canon EF 100-400mm f/4.5-5.6"L" IS USM and am very happy with the results.
Works great! October 24, 2008
Prentice Wongvibulsin (California, USA)
9 out of 9 found this review helpful
These extension tubes work great and they only cost a fraction of the price of Canon's tubes. As many reviews have said, Canon air is just as good as Kenko air... since there are no optics in extension tubes, the two do not differ in optical quality. I've used these tubes with EF 70-200mm f/4L and Sigma 24-60mm f/2.8 with no problems. They've allowed me to get right up to the subject and get some amazing macro shots without having to buy more lenses! This is a great item to have in your bag.
Showing reviews 1-5 of 44
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