Ok for light cameras

Macro focusing is - considering the price - relatively well finished. They works fine, as long as the tilt angle is not too large and the attached camera combo are not too heavy. For then tilt the dovetail guides due to the big game in the clamping and shifting the slide by means of the rack drive is very stiff. An accurate focus adjustment is a matter of luck.
Remedy:
I have therefore each additional 4 clamping screws inserted into each carriage to reduce the clearance between the rail and clamping. So now even large and heavy camera tilt angle combinations no longer a problem.
Due to the unbeatable price-performance ratio, I'm going to keep the focus despite the shortcomings.