... What is your method, Andreas? ...
Thank you for the kind comment, Mac !
I use an Epson V600 for scanning my (unmounted) slides.
I’m in Professional Mode, Color Positive Film, 48-bit Color, 2400dpi, and Target Size is set to Original.
Everything is unchecked except Digital ICE. Epson Scan is set to save as tiff.
No further adjustments so far - I found it useful to adjust the Auto Exposure Level for about one point up to High (Configuration menue).
After scanning I fine tuned the Levels for all color channels and adjusted the Tone Curve in Lightroom.
That's it.
For scanning negative film (esp. Ektar) with an Epson, there is a nice 'how to' by my friend Colton Allen :
http://www.coltonallen.com/getting-the-most-from-color-negative-film-with-your-epson-flatbed/English is not my first language, so please don't mind ...