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    • I'd look into how the Tamron performs with adapters but in general I'd avoid the 2x teleconverter. Wide open the Sony would be an F13 lens at the long end which you'll start to run into all sorts of issues with AF and even diffraction hurting the sharpness.

    • do you have the 1.4? if you do interested to see a comparison shot with and without.

      Most of my workis to be used digitally, mags, forums etc, rarely is it for print anymore, but if i know it is I shoot differently

    • I agree, I generally think of 2X extenders for good fast aperture primes, not for small variable aperture zooms.

      I have not tried the Tamron 18-400, but in the Canon mount it is of some real interest to me. I own and use the Tamron 16-300 zoom and use it quite a bit on my 80D