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Sigma EX TeleConverter for Canon EOS


New Member
I'm considering buying a sigma tel-converter 1.4x or 2.x. I have searched this site for opinions on these two converters but have not found any threads.

I have several sigma lens 50-500, 70-300, and 28-300.

I also have started some Macro pictures and have purchased Kenko extensions tube kit. 12, 20 & 36mm. Not sure which one to use for the shot.

Any help would be appreciated,
Thank You in Advance