Tested and approved "in order."

This lens I bought according to the motto: Try before.
The lens came with a well-padded case and 3 extension tubes (with screw connections and adapters) and lens cap and rear cap.
First impression: Good processing because nothing wobbles and it feels very good.
The lids fit very well and hold.
The supplied adapter T2 was not the one pictured long adapter, special adapter, a standard normal length with my delivery.
This is where I screwed and adjusted.
Then off so my EOS 1100D.
I can confirm the other recessions: Without tripod is because almost nothing, but is normal at this focal length and an aperture of 5.6, with no image stabilizer.
When focusing one would wish that the Schärfeweg would be at least twice as long.
But the adjustment is absolutely free of play and has virtually no tactile response threshold, it slides very smoothly and evenly.
The T2 adapter I have exchanged for a chip with AF, in sufficient light and contrast the camera shows me the point of focus.
The optical properties are of course not overwhelming, but gross errors I can not complain.
The donut effect is very weak and can be easily removed with any good software.
Why I can not understand the delivery accompanied by the extension tubes, the lens is already sharply from about 2 meters, and for macro photography the lens is really not suitable.
When focusing through the viewfinder, a matte screen is a good aid (tested on a Ricoh KR 10 super), it's probably on the display and 10 times magnification.
The only downside: the focusing is fine on the way from near to infinity, back it does not go so well. There is then no doubt the precision inside to complain.
With a lot of patience but you can really shoot usable images.
Judging lens, and the price does not lose sight of, then you have to say: Absolute buy recommendation.
A star degraded due to the too-short focus path.

With best regards.

Dieter.