@PapaTango, yes, it also proved to be a better solution for me.
@William Mishael, thank You.
As I promised, let me write a few words.
I received a package of Meike extension tubes today.
Tried various combinations. unlike Kenko, only all three together did not want to work.
At 50mm zoom, I couldn't get close enough to get sharpness. With 80mm and above, any combination except all 3 together, worked.
I can say that I was really surprised how quickly it sharpened.
Let me explain what happens when all three are together.
On the camera back screen, there is a red square. When sharpened, it turns green. In this case, it looks like it would change color, but it doesn't. You can see a momentary change to some shade of red, towards yellow. And don't sharpen.
Honestly, I'm satisfied with this as well. this is already a completely different situation in relation to Kenko.
I will see how it will be with the lens AF-S 70-200mm f/2.8E FL ED VR. It is planned for purchase near the end of this year.
At the same time, I would like to thank You for reading and answering.