The 2x EX is placed in the same way and it allows the photographer to use the 70-200mm f/2.8 lens as a 140-400mm f/5.6 telephoto zoom lens, and the 300mm f/2.8 lens as a 600mm f/5.6 ultra telephoto lens.
TELE converters dedicated to the APO 70-200mm f/2.8 EX and the APO 300mm f/2.8 EX lenses increase the Focal length by at least 1.4 times.
The TELE converters provide a larger focal length and allow greater mobility, which is useful for taking photographs of sport, nature and landscapes.
Well folks I gotta tell ya. I've got a Nikon D40 and I know I'm not up with the big boys but my D40 serves me very well. It continues to impress me. I've got a Tamron 18-270, amSigma 17-70 macro and a Tamron 10-24 wide angle. I cant say enough good things about all of them. I was going to expand my horizons with the Sigma APO 2X teleconverter. Now it says it works with, (and you would think it would,) Nikon mount lenes. Well the only one that fit was the Sigma and it wasn't able to move the entire zoom distance. I still like Sigma and want to pick up the Sigma 50-500 or the 70-200. I really do hope I just got a bad one off the line.
On a good note, really good construction!
Take care folks.
Sgt Jackson
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2 of 6 people found the following review helpful
Additional considerations, Saturday, 24 October 2009
Overall rating (weighted)
4.0
Sharpness
5.0
Build Quality
4.0
AF Speed
3.0
Value for Money
4.0
Perhaps I should not have been ... but I was surprised by the things I had not thought of before buying this lens extender. The first is that it made my autofocus shock reduction camera into basically a manual camera. Perhaps I had not attached the tele-extender properly to my camera, (several times under different conditions). But I could not get the autofocus to work. There's also another consideration: when you increase the telephoto power, you reduce the area of the objects you are imaging. You are also increasing the speed of the subject in relationship to the frame. When I took a picture of a goose in the back yard, the goose ended up walking partially out of the frame by the end of the extended exposure. When I took a (tripoded) picture of Jupiter, the planet had moved away from the focus point - blurring the image and giving it an extended oval shape. Although I was able to distinguish the moons of Jupiter, four that night, they too were blurred. In both cases the tele-extender worked correctly - as far as I could tell. And in itself it gave clear images. However, I may have been able to gain a better final image by cropping and editing an original from the standard telephoto lens. I haven't abandoned the tele-extender. I'm experimenting with it to find the appropriate application. Al.
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2 of 6 people found the following review helpful
Not worth the money, buy a better lens instead, Monday, 28 September 2009
Overall rating (weighted)
2.3
Sharpness
3.0
Build Quality
2.0
AF Speed
3.0
Value for Money
1.0
I spent a day photographing a sailboat race from the shore, and thought this would be an ideal time for the converter. I was using a Sigma 50-500, so with the teleconverter, I thought I was set. When I got home, I found the photos were never sharp or crisp, and just slightly blurry when zoomed in. The next night I used the same setup to take shots of the moon, with the same results. I took off the teleconverter, and I got sharper photos. If you need good crisp accurate shots (and who doesn't?), the teleconverter does not help. I don't see a point to ever use this item again. I bought my converter on E-bay for much less, but it's still not worth the money or the expectations. It's better to just save your money and get a better quality lens.
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8 of 9 people found the following review helpful
Great Kit to have with Sigma lens, Friday, 07 August 2009
Overall rating (weighted)
5.0
Sharpness
5.0
Build Quality
5.0
AF Speed
5.0
Value for Money
5.0
Hi, I have Sigma 50-500mm lens, with Nikon D90 camera, so this x2 teleconverter used to get 1000mm focal length, and it was more than GOOD. You will need the stand for your camera and you will get real nice and far shots.
To see the result please visite my flickr account on this link: [...]
The only shortage is the fatc that you can't use it with Nikon lenses, I don't have other Sigma than 50-500mm, so I don't know if it will work with others like Sigma 50mm, or 70-300mm or any other sigma lens.(it should works)
If you will capture birds, wild-life or the sky, I think you will need it.
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5 of 6 people found the following review helpful
Useful Purchase, Monday, 25 May 2009
Overall rating (weighted)
3.8
Sharpness
4.0
Build Quality
4.0
AF Speed
4.0
Value for Money
3.0
This has proven to be a useful item and a worthwhile investment. It can be used in AF mode (on the lens to which it is attached) but with a longer lens (400+) it is better used in manual focus. I'm glad I purchased it and I use it frequently in taking pictures of birds and wildlife.
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19 of 19 people found the following review helpful
Useful enhancement, within reason, Thursday, 21 May 2009
Overall rating (weighted)
4.0
Sharpness
5.0
Build Quality
3.0
AF Speed
4.0
Value for Money
4.0
First, to set things straight: this TC is intended for only Canon cameras, and for Sigma lenses that mount on a Canon camera. Anything else, you're taking your chances. Second, there are optical laws that invariably predict a 2-stop decrease in the amount of light hitting the sensor. And finally, glass, no matter which brand or how many exotic elements in it, has undesirable characteristics and you will always lose some amount of clarity, saturation and perceived quality (how much varies from lens to lens and eye to eye).
Now that those fundamentals are out of the way, the results and recommendations. I took several photos using this TC mounted on my Sigma 70-200/2.8 and my Sigma 150-500/5.6~6.3. I also attempted to mount my Canon 28-70/2.8L on it, but the fit did not work (it scrapes and sticks and will not lock into place), and thus I believe they are incompatible. I did not test it with my Sigma 10-20/4.5~5.6 for obvious reasons.
AF is maintained throughout the entire range of the 70-200/2.8, as advertised in Sigma's compatibility chart. MF is engaged electronically for the entire range on the 150-500/5.6~6.3, again per the chart. AF through the 70-200 is solid, accurate, and has no degradation of speed. MF through the 150-500 @ 500 is, as one should understand, a touchy process, though it's aided considerably by the optical stabilization function.
Image quality @ 500mm (really, 1000mm) is not spectacular (though what does one expect, given a maximum aperture of about f/12.9). I didn't expect wonders but I had hopes of better. Some of this is inevitably due to my challenge in focusing, which is difficult without a split-prism finder. The image quality is still fairly bright and saturated, but somewhat noisy-looking. Exposure was accurate. I need to test on monochromatic surfaces to determine what's going on with the noise.
Tripod-mounting the camera, lens and TC for the 1000mm (500mm doubled) test shots produced the best results, improving further with MLU enabled and use of an IR remote. Image quality @ 400mm (200mm doubled) is acceptable and this should be the recommended pairing of lens and teleconverter (70-200/2.8 with this TC). This pairing results in a decent-quality 400/5.6 for well below the price of Canon's prime and Zoom lenses in this range. I won't claim that the image quality is better; just, it's decent, and you save a lot of money.
Build quality of the TC is fine and nothing is worth further comment other than that it's a solid, well-built TC with multicoated elements.
I wavered between a 3-star and 4-star rating. I have owned two other TCs, and they were unquestionably 1-star at best. I went with four for this one because of its good performance with the 70-200/2.8, maintaining AF with that lens, and having pleasing build quality (I have no concerns about taking it out and using it frequently). I am however disappointed about the performance with the 150-500/4.5~5.6. I would give it a 3-star for its performance with the 150-500. I think it should at least attempt AF, and if the user has to give up and set it to MF, fine. Here, we don't even have that luxury, and there's no explanation on Sigma's website or the product literature. So, if you are considering this to get yourself a cheap 1000mm lens, be aware of the drawbacks (full-time MF, somewhat noisy images, and challenging focusing in even overcast light). If you're wanting to extend a 70-200, this is the sweet-spot.
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6 of 6 people found the following review helpful
nice little add on, Saturday, 11 April 2009
Overall rating (weighted)
3.8
Sharpness
5.0
Build Quality
4.0
AF Speed
3.0
Value for Money
3.0
I have had one about two months and like it a lot. My wife just bought one too. It is great in daylight and strong lighting such as in football stadiums in Texas. Understand, though, that when the sun sets or lights are dim, this extender will give you some dark pics no matter what you do to compensate. My wife and I use the 2x on Canon 50D cameras and even ISO of 6400 will look pretty bad due to the noise and softness of the image. Not bad if it's a hobby-- not good if it's a business. Kent & Jackie www.kjwesphotos.com
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0 of 0 people found the following review helpful
nice little add on, Saturday, 11 April 2009
Overall rating (weighted)
4.0
Sharpness
3.0
Build Quality
4.0
AF Speed
4.0
Value for Money
5.0
I have had one about two months and like it a lot. My wife just bought one too. It is great in daylight and strong lighting such as in football stadiums in Texas. Understand, though, that when the sun sets or lights are dim, this extender will give you some dark pics no matter what you do to compensate. My wife and I use the 2x on Canon 50D cameras and even ISO of 6400 will look pretty bad due to the noise and softness of the image. Not bad if it's a hobby-- not good if it's a business. Kent & Jackie [...]
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0 of 0 people found the following review helpful
tough to use, Saturday, 07 February 2009
Overall rating (weighted)
3.8
Sharpness
4.0
Build Quality
4.0
AF Speed
4.0
Value for Money
3.0
This lens doubles your existing lens but do you have the right lens and are you good at manual focus?
It certainly doubles certain lenses but getting that list seems difficult to do. I bought this product and it works as advertised although I had to look at the other lens I bought to figure out if this lens worked with it!
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3 of 3 people found the following review helpful
Great for the price, Thursday, 29 January 2009
Overall rating (weighted)
4.8
Sharpness
5.0
Build Quality
4.0
AF Speed
5.0
Value for Money
5.0
I have the Canon 70-200mm F2.8 IS lens (and yes, it's much better than the Sigma!). My Sigma AF went out less than 2 months use. So I am very pleased to find out that this teleconverter works with My canon. The pictures came out better with this Sigma converter and the Canon lens - than the Sigma lens with the Sigma converter. Picture quality will always suffer slightly because of this teleconverter.
I also tried the Canon Lens on a Canon Converter. Honestly - I could not see a difference. Other than color of the converter.
Good Buy - Cheap enuff to buy the 1.4 converter too.
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1 of 11 people found the following review helpful
not compatible with Sigma 18-55 mm lens, Tuesday, 13 January 2009
Overall rating (weighted)
1.3
Sharpness
2.0
Build Quality
1.0
AF Speed
1.0
Value for Money
1.0
I purchased this teleconverter and found that it did not work in auto mode with the Sigma 18-55mm telepohoto lens. Have to decide if I have to buy another lens to again auto capability.
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3 of 11 people found the following review helpful
Poor focus when used with Sigma 50-500mm Telephoto, Friday, 31 October 2008
Overall rating (weighted)
1.3
Sharpness
1.0
Build Quality
1.0
AF Speed
1.0
Value for Money
2.0
I bought this teleconverter to use with the Sigma 50-500mm f/4-6.3 APO DG Telephoto Zoom Lens for Nikon SLR Cameras. My intent was to use it for bird photography with my Nikon D200. However, after thorough testing in good light (Better Beamer, F11, 1/250, ISO 200), I was unable to get clear images (tried both auto and manual focus).
I returned both the telconverter and the Sigma 50-500mm.
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3 of 10 people found the following review helpful
Poor focus when used with Sigma 150-500mm Telephot, Friday, 31 October 2008
Overall rating (weighted)
1.5
Sharpness
2.0
Build Quality
1.0
AF Speed
1.0
Value for Money
2.0
I bought this teleconverter to use with the Sigma 150-500mm f/5-6.3 AF APO DG OS HSM Telephoto Zoom Lens for Nikon Digital SLR Cameras. My intent was to use it for bird photography with my Nikon D200. However, after thorough testing in good light (Better Beamer, F11, 1/250, ISO 200), I was unable to get clear images (tried both auto and manual focus).
I returned both the telconverter and the Sigma 50-500mm.
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9 of 10 people found the following review helpful
Very pleased, Friday, 02 May 2008
Overall rating (weighted)
3.5
Sharpness
3.0
Build Quality
5.0
AF Speed
3.0
Value for Money
3.0
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.
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25 of 26 people found the following review helpful
Sigma 2X EX DG APO Teleconverter for Nikon AF Came, Friday, 16 February 2007
Overall rating (weighted)
4.8
Sharpness
5.0
Build Quality
4.0
AF Speed
5.0
Value for Money
5.0
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.
