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As stated above there are many possibility for your issues. The TC does effect sharpness but the newest TC-20E III should perform well with the 300/2.8. In order for us to help you, you need to help us by giving us more information. Can you post some sample images with EXIF intact?What are your typical shutter speeds?Are you shooting handheld or using a tripod?What is your ISO?What aperture are you shooting at? Is anything in the image “in focus” or is the entire frame blurred?How far away are the birds? i.e. how big are they in the frame?Without answers to all of those questions we have no way to help you solve this problem.Please, help us - so that we can help you.
Dave SummersNikonians Photo Contest DirectorMy Nikonians Gallery | Current Nikonians Contests