I just tried a Sigma 1.4 Teleconverter on a Sigma f2.8 70-200mm lens, with my Pentax K10D camera, and there was no autofocus and the F stop display flickered non stop
Cameras - Sigma - 1.4x DG EX APO for Pentax (824109) Lens Converter
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Answers & Comments
You need to send it back to a sigma agent