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    Canon 300 mm f/4 L IS + 1.4 x TC or Canon 400 mm 5.6 L

    Hello all, I am using a Canon 300 mm f/4 with canon 40D and seldom use the 1.4 TC with this because I am noticeing that the result of this combo is not sharp and good. Now the reach of 300 mm is something I felt less and I want to upgrade to a larger focal length. I don't know whether the...
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