Negative Positive
Title: It pasted the test
Review: I received my Sigma APO EX DG 1.4x teleconverter a few days ago. Right away I started my test to see if this converter would stand up to my hard inspection. I've tried converters before (Tamron pro 1.4x, Nikon 1.7x, 1.4x, and the new Nikon 2x series III with the Nikon 70-200mm VR lens) and none satisfied me. I now have the Sigma 70-200mm F2.8 EX II, the Sigma EX DG 100-300mm F4 lens and the Sigma 150mm EX DG macro. I am very pleased with the results of my test. I saw very little image and contrast loss with both lenses. This is one very good teleconverter. It stood up to the resolution charts and field tests with no problems. Unlike one review posted, I find the build is very solid, top quality.It earned a well deserved spot in my camera bag.
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