Product Description

The multi layer lens coating and lens design reduce flare and ghost, which is a common problem with digital cameras and also creates an optimum color balance through the entire zoom range.

Product Details

• Brand: Sigma
• Model: B000CDA7Y4
• Dimensions: .52 pounds

Features

• Teleconverter lens for Nikon SLR cameras
• Increases the focal length by the power of 2
• Multi-layer lens coating and lens design reduces flare and ghosting
• Includes lens case

Amazon.com Product Description
The Sigma APO Teleconverter 2x EX DG for Nikon Digital SLR Cameras is a dedicated APO teleconverter that can be mounted between select lenses and the camera body to increase the focal length by the power of 2. The multi-layer coating reduces flare and ghosting, which is a common problem with digital cameras. The lens also offers maximum magnification without any variation in the minimum focusing distance. Compact and lightweight, this teleconverter can convert your lenses into longer focal-length lenses, so you don't have to do a lot of unnecessary footwork. A case for the lens is included.

Customer Reviews

Sigma 2X EX DG APO Teleconverter for Nikon AF Cameras
After reading the two reviews above, I was somewhat baffled. If you do any research on this product, you will find it clearly is made only for use with Sigma lenses, not Nikon lenses. The instruction manual that comes with the converter even lists which specific Sigma lenses to use. If you want a converter for Nikon lenses, buy the Nikon TC-20E (retails for more than twice the Sigma). Of course the quality of this product is poor when using a Nikon lens! I have a Sigma 70-200 zoom and it works beautifully; it is well worth the price.

Very pleased
I got this 2x converter to match the Sigma 70/200 2.8 lens. I have shot around 100 pics with this set up and have been very pleased with the results. I have shot wildlife to school track meets.
The only reason I couldn't give this converter a perfect mark is I can't use it with my other Nikon lens.

Very Nice, and Useful Accessory
overall, i like this teleconverter. I use this with the new sigma 70-200mm F2.8 II lens for Rebel XTi. the F-stop became 5.6 with teleconverter, but i get up to 400mm zoom, which makes quite a difference. While it's true that most of my pictures came out soft, but some pictures came out quite sharp- so it may just be me. there is some slight color distortion, but it's only more noticeable when you shoot macros.

i glad i got it. and it has allow me to extend my lens from 140-400mm, of which 200-400mm is a critical range for wildlife and sports.

Update: July, 08
Okay, after a couple months of using Sigma 70-200mm F2.8 EX II lens, I found out that the Macro function is almost useless because of its such poor quality (soft focus and CA)- so the F has to be 9 or greater...now when you add this Teleconverter your F number is going to be even higher (i found the sharpest image at F22!!).....lowest i try to get an usable image is around F15 or more. Now this is macro.

Just make sure you have plenty of light, and that the subject is far away and then this will be a great add-on for you.


UPDATE:
I originally bought this for my Sigma 70-200mm F2.8 Lens- and i really doesnt like its performance at the low F-stop (blurry, ca, and other problems), but i just got the Canon 70-200mm F2.8 IS lens (and yes, it's much better than the Sigma!), and is pleasantly surprised to find out that this teleconverter works with it! in fact, the pictures came out better than the Sigma lens- so I think the picture quality issue is because of the lens not because of this teleconverter.

overall, you're still going to get the best picture quality without this teleconverter, but with 2x and Canon, I think this will produce a better picture than any 70-300mm lens out there.