At most undercooked

I bought the adapter to use it on the iPad 2 with a Samsung PL50, namely via a USB cable. Here exactly is not working.
In the first experiment no response, the second an error message such as "this product can not be used" or something like that.

So then removed the SD card from the camera and plugged into the adapter, which went straight away! Stop is cumbersome and fitzeliger - and not as actually desired, but a return wars me then but not worth it.

The adapter itself is a typical Chinese product, with poorly translated, nothing meaningless English instructions (in the example, a USB keyboard is displayed, but is otherwise not a word about it ... is to each his part think ?!).