I used to exposure aperture 11, the Belichtingsregelung I left the camera's automatic in cooperation with the Nikon flash SB 900. Here I flashed with mounted diffuser in about 50 cm distance against a white wall.
The result is both qualitatively superior above all on the processing speed of the work with a flatbed scanner, only with slide scanners in the upper price category or with considerably more effort (converted slide projector) can achieve similar or even better results.
Conclusion: For little money a thoughtful and practical solution.