Sadly you neither seem to having any social media etiquettes nor any understanding of technology. For your information I have both Z9 & A1 & have professional level lenses like Sony 300 f 2.8 , Nikon 500 Pf & Nikon 400 f 4.5 . I use them regularly & know them well including what TC to use with what answered the questions in good faith since the question was routed to me . Now I realise that it was my mistake to have answered your question

Buy it from where ever you are getting the best price

Sir, Kindly raise for the price match request or reach out to our support team for further help. this column is meant for product related queries.

It is not recommended to use it with 2xTC