Teli Reviews

See the excellent review below which lists the pitiful handful of Sigma lenses that this teleconverter is compatible with. I wish I'd read it before I ordered it (I had to return it after opening it, the list is only INSIDE the booklet*). I have several wonderful Sigma lenses, but none are on that list, and the ones on that list would duplicate what I have, so I have no intention of bying one of the few lenses this teleconverter could work with. *Also inside the booklet is a warning that trying to use the lens with any lens not on the list may damage both the converter and the lens. Well, yeah, a quick glance shows that they used the standard connecting bayonet at only one end (the camera end) and used some strange lens-specific screw mount at the other end. And the possible reason: My Nikon camera body has plenty of space behind the bayonet mount in case the lens needs to extand back a little, but this teleconverter extends FORWARD beyond its front so only a lens with plenty of space "in front of" the bayonet mount (ie, at the lens' camera end) would be able to mate with this. So it looks like they have to specially design lenses just to be compatible with this odd teleconverter, and that would explain why the list is so short.

This converter not only work only on Sigma Lenses - BUT CERTAIN SIGMA LENSES!

The converter will work in MF mode only, unless noted, on the following APO lenses:
Macro 180mm f3.5 EX IF HSM
300mm F2.8
300mm F2.8 EX HSM (AF)
Tele Macro 300mm F4
Tele Macro 400 F5.6
500mm F4.5
500mm f4.5 EX HSM
800 F5.6
800 F5.6 EX HSM
1000mm F8
50-500mm F4-6.3 EX RF HSM
70-200mm F2.8 EX HSM (AF)
70-210mm F2.8

This has really turned me off from Sigma, as this IMPORTANT information is NOT listed anywhere!

This 2X teleconverter is a great addition to any fast Sigma lens. I use mine with my Sigma 70-200 f/2.8 HSM. It is sharp, well made, and a relative bargain. I recently used it to shoot at Road Atlanta and was very impressed with the results.

Of course, it is not designed to use with Nikon lenses, only Sigma lenses on Nikon bodies! And that job it does very well.

I bought this teleconverter with a 70-300 sigma lenses and it did not mention anywhere (editorial reviews or specifications) that it is compatible with only a specific number of lenses. But the review for the nikon compatible teleconverter it does so. Make sure before you buy it that it will fit your lenses.

I bought this teleconverter to supplement a 1.4x converter that I already owned. I wanted to try it out with my Canon 200mm 2.8 lens and compare the results to my 400mm 5.6 lens.

The converter is nice and compact, has a good quality feel to it, and seems to work very well. I shot one roll of film with it so far and was very happy with the results.

Remember that you lose 2 shutter stops when using this converter so it should only be used with a fast lens such as a 2.8 or 3.5 etc.

Works wonderfully with my Sigma 70-200 f/2.8 HSM. Fast, very sharp. Seems to be very well made. A great addition to any fast Sigma lenses.

I use this converter on my Sigma 70-200 f/2.8 HSM Nikon mount. I used it first last fall at the Petit Le Mans at Road Atlanta and was very impressed with the results. Aperture is reduced to f/4, which is still a bright finder, and autofocus operation is not negatively effected. All electronic functions such as HSM and D coupling still work. Very sharp from my experience.

The Sigma APO teleconverter is a little more than half the price of the Canon teleconverter, and it boasts an APO element to reduce chromatic aberration. I've found this teleconverter to be reasonably sharp, but there is noticeable vignetting when I use it with my Canon 300mm f4. Sigma claims that the teleconverter is designed to be matched with their high-end tlelphoto lenses, and perhaps this is the case. However, I wasn't very satisfied with the performance of this teleconverter.