the value for money is excellent. However, if Macro with intermediate rings is a common and effective work, I recommend more rings in metal version of Novoflex / Kenko. At the 55mm 1.8 / 35mm 2.8, there is no Vignetierungen. Vignetieren Neither at the R7 / still at 6000. The 4.0 24-70mm / 70-200mm 4.0 / 4.0 16-35mm. In Wide stronger than in telephoto position. However, since both sensors are in high resolution, can be worked out without problems, a smaller cut. Mandatory is the grinding (80 grain) - inside the rings. These are high-gloss. Once very bright scenes are processed, there is very significant reflections. The optical quality is outside the rating because here comes no optical system for wear. Of course, the modified flange changed the Functioning of the Opitk. Not only in terms of scale but also in image quality. However, I can see no disadvantages with the best intentions. It is recommended the combination camera always to wear at Opjektiven because the rings appear to me to be unstable. The transfer of the exposure parameters are properly
