Introduced in 1978, the TC-14 was a result of a combination of research and innovation from Nikon lens designers as the previous TC-200 and TC-300 designs rendered a 2-stops lessening of light incident on the image plane. The introduction of a 1-stop+ exposure compensation teleconverter was welcomed by many photographers.
An amazing aspect of the TC-14 Teleconverter at the time was that had been designed as a “pancake sized” optical device and usable not only on a number of super-telephoto lenses but also on certain Nikkor lenses with shorter focal lengths. It offered a 40% increase in magnification of primary focal length and only one f-stop decrease in the effective aperture. Measuring merely 64.5mm diameter x 33.5mm height and weighing only 165g, this is the lightest and the most compact manual lens teleconverter of all.
The teleconverter is particularly useful for use with the 180mm f/2.8 lens and also with the Nikkor 135mm f/2.0s, the Nikkor 135mm f/3.5s, the Nikkor 200mm f/2.0, and some Zoom-Nikkor lenses beyond 200mm. The TC-14 was introduced as a true Ai Teleconverter and it incorporated an Ai lens coupling for automatic diaphragm and full aperture TTL metering with all Ai Nikon SLR camera bodies. Nikon Integrated Coating was applied to all lens elements for outstanding resolution with virtually no loss in image quality. Another optical characteristic is its high contrast and excellent color rendition.