I was looking into extenders(Teleconverter) for Canon lenses, and they are quite expensive at around $450 for the 1.4x III or 2x III. I know that extension tubes are a different story, and since they contain no optics the brand really doesn't matter. But what about for extenders? Do third party options exist and are they worth looking into?
Related: Are there any downsides in using 2x extenders?
Answer
Third party options do exist and are worth looking into. Sigma does make teleconverters, although I am not certain whether they will only fit certain Sigma lenses or also Canon ones. The teleconverters from Kenko/Tamron/Soligor (pretty much the same thing) are of interest because they lack the protrusion that Canon and Sigma ones have which have to slot into a similar opening in the lens; this means that the Kenko/Tamron/Soligor converters can be used on any lens you choose to mount it to and not only the longer tele lenses that are explicitly designed for use with converters. I have used an 1.4x Kenko converter with a Canon 100mm macro and an old 80-200/2.8L, neither of which are compatible with Canon teleconverters.
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