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Message: <blockquote data-quote="Bukitimah" data-source="post: 108607" data-attributes="member: 7507">Dear Pierro, Thank you for your response. Adding the TC to my 70-300 is going to slow down the AF is given and I can accept that. Without the TC, the 70-300 itself is also slow under low light. As a matter of fact, under good light, with the TC, AF is acceptable. However, the IQ isn't much better with the TC than cropping the image without TC. In my opinion, the TC only helps to give the shooter a clearer image for subject slightly further. This way, I know when is the best shot rather than just multiple shots.My conclusion, no need for TC if you are using the 70-300.</blockquote>