In memory of the analog photography and my shots with Markroringen at a TL 1000 with Zeiss lens, I wanted to try it again. Actually, I was expecting a certain Qulitätskontrolle. Now some might want to notice, then one should spend just more money. My dear critic, since it ensures that much expensive Markroringe are always free of errors? My experience with so many expensive production shows the opposite. At the macro rings. When EOS 7D functioned only the rings 21 and 31mm. The 13mm-ring generated inside the camera, an error message. Thus, the rate declined. The processing carried out by Amazon usual fast and good. In order not to play tester, I bought the Tamron SP 90 DI VC USD. Sure, a huge price difference but no more frustration but pure joy. Review the lens follows. So who has the courage to test and would like to return to the Macro rings can buy. I would not recommend.