I had my TC14 modified today. I just tried it with TC20 and 70-200VR on my D2H. To my surprise, I could even handhold the combo! Both VR and AF were still working. I guess the combo has fooled the D2H and it thinks only TC20 is mounted. Therefore I'm still able to open to f5.6 and the EXIF shows focal length as 2X (400mm). Does this make sense?