Evaluation:  
Conclusion: Sigma APO Teleconverter 1.4x EX DG for Canon Digital SLR Cameras
Review: I did a lot of research on this item before I bought it. Nowhere did I read a bad review or rating and most buyers raved about how their pics remained sharp as a tack with the Sigma 120-300 mm f2.8 lens, but this is not what I experienced. All my pics are now slightly out-of-focus when I use this lens so I no longer use it and mark it off as a bad purchase.
Evaluation:
Conclusion: Great match-up with the Sigma 70-200, f2.8 that gives you a 100-300, f4 zoom
Review: Optically outstanding when combined with the Sigma 70-200 f2.8 EX DG. This new Sigma EX DG lens and converter is super sharp and great color that stacks up to the famed Canon L series at about 60% of the cost. I see incredible clarity at 800% magnification doing touch ups in Photoshop.
I've used both and wouldn't hesitate a second buying the Sigma DG series again.
Advanced amateur who loves Canon.
Evaluation:
Conclusion: Sigma APO Teleconverter 1.4x EX DG for Canon Digital SLR Cameras
Review: Not compatable wth Cannon lens only selected Sigma lens
Evaluation:
Conclusion: Excellent piece.... worth to buy.
Review: This is an Excellent piece from Sigma, I've tried it on my APO MACRO 150mm F2.8 EX DG HSM and CANON 20D Body,the results was marvelous, no loose of sharpness, seems to be part of the original lens, you can sell your photos even ..What else ..?
The only thing I didn't like is that,with the 150mm macro lens,the 1.4x APO Tele Converter, AF operate between infinity and 0.52m, If the subject is closer than 0.52m, only MF is available,also similar case with 180mm macro ,but with different figures.
With other compatible lenses like (APO 300mm F2.8 EX DG HSM) it work fine with AF.
Finally I recommend this one over the 2X for Sigma compatible MACRO lenses, since the auto focus still working.
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