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<blockquote data-quote="Bengt Nyman" data-source="post: 471599" data-attributes="member: 13692">The newer TC14iii is missing the mechanical linkage required for the camera to set the aperture. I am left with only f/5.6.The older TC14ii does have the mechanical linkage so that the camera can control the aperture.I believe that Woodyg3 is right. I should buy a TC14ii. What has held me back is the slight trade-off in image IQ:<a href="http://www.luminescentphoto.com/blog/2014/12/26/review-nikon-tc14eiii/" target="_blank">Review: Nikon TC-14E vs. TC-14EIII | Digital Photography Insights by Jason Odell</a>P.S. A couple of alternatives that I have looked at is to use a Nikon D7200 to gain 50% reach, which with a 300mm and a TC14 amounts to 630mm.A more drastic solution would be an Olympus OMD1 with the new Zuiko PRO 300mm lens coming soon for a reach of 600mm.I have done a lot of experiments lately fine tuning a D800E and a D810 with a 300mmF4+TC14 for birding at different distances. It is discouraging to see the required fine tuning move all over the place as a result of the object distance. At least a mirrorless setup would eliminate that problem.</blockquote>

[QUOTE="Bengt Nyman, post: 471599, member: 13692"] The newer TC14iii is missing the mechanical linkage required for the camera to set the aperture. I am left with only f/5.6. The older TC14ii does have the mechanical linkage so that the camera can control the aperture. I believe that Woodyg3 is right. I should buy a TC14ii. What has held me back is the slight trade-off in image IQ: [URL="http://www.luminescentphoto.com/blog/2014/12/26/review-nikon-tc14eiii/"]Review: Nikon TC-14E vs. TC-14EIII | Digital Photography Insights by Jason Odell[/URL] P.S. A couple of alternatives that I have looked at is to use a Nikon D7200 to gain 50% reach, which with a 300mm and a TC14 amounts to 630mm. A more drastic solution would be an Olympus OMD1 with the new Zuiko PRO 300mm lens coming soon for a reach of 600mm. I have done a lot of experiments lately fine tuning a D800E and a D810 with a 300mmF4+TC14 for birding at different distances. It is discouraging to see the required fine tuning move all over the place as a result of the object distance. At least a mirrorless setup would eliminate that problem. [/QUOTE]

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