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Message: <blockquote data-quote="Vincent" data-source="post: 564347" data-attributes="member: 15675">My first conclusion: Can you see more sharpness on the ground, not clear from the pictures, but could be.You might have reached a limit on your combination, I do also see that near focus sometimes performs different then far focus on the same TC + lens combination (see an MTF graph on lens performance which will confirm, TCs accentuate this effect).One point not mentioned here, in sunny weather the air movement can make your picture blurry. I did not see this particularly in your examples, but it is an effect. Also the position of the sun can work on the contrast, depending on the lens. You have to learn about the set-up you are using.</blockquote>