[Leica] TECHNIES : A query about sharpening after scanning slides

[photo.philippe.amard at gmail.com (Philippe)]

Hi All,

I?m looking for proven software that actually works for sharpening scans, 
mainly slides at the moment.
 
The ideal candidate should be running on a Mac, possibly from LR, and 
optionally be freeware ...

Thanks in anticipation for sharing your practices as I have read tests but 
prefer to rely on hands-on experience from trusted sources, i.e, you :-)

Amities

Philippe