A TC20E becomes an electrified extension tube

Started Sep 26, 2012 | Discussions thread
Marianne Oelund Veteran Member • Posts: 7,779
Eliminating the focal length/aperture change

mmalkin15 wrote:

A TC20E becomes an electrified extension tube

Lenses compatible with teleconverters use the 9th and 10th contacts to detect an attached teleconverter and adjust their reported focal length and aperture.

If you open-circuit one of those contacts on the teleconverter, the lens will report its "native" parameter values instead of double focal length, etc. Not only that, but AF speed will be improved.

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