The internal lever shifts the TC elements L<>R on the 180-400 f4E TC14, and presumably the same in the 400 f2.8S. Note the internal TC in the latter is larger and more complex than any of Nikon's external F mount TC14's, although its large anterior element is reminiscent of the ext ZTC14.
If each and every copy of these two exotics needs to be tuned as a bespoke assembly, this would explain yet an extra factor in their high price and also manufacturing time. This would be similar with the 800 f5.6E FL, in which each copy and 800-TC125 have matching serial numbers for a good reason. I've heard from Nikon staff that each of the F-mount exotic primes is tuned by a highly experienced meister at final assembly. An ambassador, I know, shook the hand of the gentleman who had assembled his copy of the 600 f4E FL (on a guided factory tour a few years ago).
https://www.nikon-image.com/products/nikkor/zmount/z_teleconverter_tc-14x/spec.html
If each and every copy of these two exotics needs to be tuned as a bespoke assembly, this would explain yet an extra factor in their high price and also manufacturing time. This would be similar with the 800 f5.6E FL, in which each copy and 800-TC125 have matching serial numbers for a good reason. I've heard from Nikon staff that each of the F-mount exotic primes is tuned by a highly experienced meister at final assembly. An ambassador, I know, shook the hand of the gentleman who had assembled his copy of the 600 f4E FL (on a guided factory tour a few years ago).
https://www.nikon-image.com/products/nikkor/zmount/z_teleconverter_tc-14x/spec.html
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