The processing of the ring is absolutely fine. However, you should be aware that all settings must be made manually. The contacts finally hanging forward in the air. As with many lenses (for Sony!), The aperture snaps back with a spring should this have an auxiliary means. A lens cap which has a nose for the aperture can drill to the center.
Otherwise too little light would hit the sensor. Although the closed aperture increases the very shallow depth of field, but it also ensures increased diffraction blur.
All of these relationships can be experienced with this ring super themselves and already make first spectacular images. For the price really great!
Another tip: a macro sled the 10-15 class is very convenient. However, to find the sharp area also requires a little practice with sled.
