Chinese extension tubes for Sony FE (MF) are very poor and almost unusable. Their only purpose is to estimate the needed tube length. And after some estimation, I decided to find an original Pentax extension tube.
The difference is that a Chinese tube is mounted between the camera and a Pentax K - Sony FE adapter, while a Pentax tube is mounted between a Pentax K - Sony FE adapter and a Pentax lens.
This is the extension tube #3 of the Pentax Auto Extension Tube Set K.
The set contains 12, 19, 26mm tubes. So this tube #3 is 26mm long. It is enough for my tasks.
This set is called "Auto" because it supports the stop-down indicator and aperture control of the Pentax K mount (only mechanical, there is no electronic).
This means that I can control the aperture with a Pentax K - Sony FE adapter (model 1, model 2). It is very convenient for open aperture focusing.
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