+ Luminous intensity
The maximum aperture of 1.4 opens up a lot of creative leeway, the Nacheinstellgrenze 30cm contributes here also doing its part. On nice days, you often get into the situation that the minimum shutter speed of 1/8000 sec (ISO100) is too long. The high light intensity can be used for available light shooting very well.
+ Auto Focus
The autofocus works thanks to ultrasonic drive very quickly and virtually silently. The accuracy is very good, only the lens sometimes located next to the were concentrated at distant objects. This problem can possibly be solved with the USB dock. Despite the large aperture, the lens can also be manually easily and unerringly focussieren because of the angle of rotation is at the Focus Ring between 30cm and infinity approximately 90 °.
+ Picture quality
As mentioned by previous reviewers, the lens also provides here no reason to complain. Open aperture, the image quality over the entire image area at a high level, at f 2 set sharpness and contrast even more significantly. Vignetting also plays Aperture 2 is no longer relevant. The longitudinal chromatic aberration is my lens at maximum aperture at relatively high levels, and this effect is greatly reduced even at aperture 1.6.
+ Price / Performance
succinctly: perfect
In summary, the lens gives a clear recommendation. The price is reasonable, the quality of both the lens and the produced images are at very high levels.
