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<blockquote data-quote="Woodyg3" data-source="post: 471617" data-attributes="member: 24569">As Bengt stated, I was refering to his problem with limited aperture control with the TC14III. I have the Tamron 150-600, and also the Nikkor 400mm f/4 w/ TC 14E. I would not call the results with the Tamron mediocre, in fact they are significantly better than any other similarly priced telephoto zoom I've had experience with. I guess I have been lucky, but I have had only very occasional problems with the Tamron's autofocus.&nbsp;I don't have a 1.7x teleconverter, but I have heard often enough from those that do that the fall off in sharpmess is pretty significant. I feel confident that the Tamron at 600mm would be sharper than the Nikkor w/ 1.7TC.That said, I use my Nikkor 300mm w/ 1.4 TC for birding the majority of time. It is sharper than the Tamron, and focuses better. Only if I feel I need the image stabilization of the Tamron in dark situations would I rate it a better choice. (As in shooting owls at dusk or in a very shaded area.)</blockquote>

[QUOTE="Woodyg3, post: 471617, member: 24569"] As Bengt stated, I was refering to his problem with limited aperture control with the TC14III. I have the Tamron 150-600, and also the Nikkor 400mm f/4 w/ TC 14E. I would not call the results with the Tamron mediocre, in fact they are significantly better than any other similarly priced telephoto zoom I've had experience with. I guess I have been lucky, but I have had only very occasional problems with the Tamron's autofocus. I don't have a 1.7x teleconverter, but I have heard often enough from those that do that the fall off in sharpmess is pretty significant. I feel confident that the Tamron at 600mm would be sharper than the Nikkor w/ 1.7TC. That said, I use my Nikkor 300mm w/ 1.4 TC for birding the majority of time. It is sharper than the Tamron, and focuses better. Only if I feel I need the image stabilization of the Tamron in dark situations would I rate it a better choice. (As in shooting owls at dusk or in a very shaded area.) [/QUOTE]

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