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In general, when you add optical elements that were not part of the original optical lens formula (i.e. TC's) it will have a negative impact on image quality. Quite often this shows up as a significant increase in chromatic aberrations in difficult light situations, also affecting bokeh, and adding a TC always reduces the maximum lens resolution possible (...


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If you use x2 teleconverter this will create you lens F8. And for this combination (camera+teleconverter+lens) camera will focus only on first photo and then will lock the focus - source (if you are in Continuous Shooting). Which can be a problem for type of photos you show. Also when add teleconverter you decrease in some degree the sharpness of the photos (...


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