Since this discussion has shifted towards scanning aspects, I shall talk about scanning a bit..
Flatbed scanners: Terrible resolution, terrible SNR (hence why shadows are poor on slides on them, even though technically within the range captured by the scanner).
You can actually improve both resolution and SNR with software technique. SNR simply by stacking (dont use VueScan multipass, it doesn't align your images and blurs them even more) which greatly improves SNR if you wish to dig into shadows.. for resolution you have to go a bit further and use superresolution technique, but it requires more than a single sample of a scene, but luckily for us our scene doesn't change (the film).
Superresolution legitimately overcomes deficiencies in an optical system, legitimately overcoming both resolving power and diffraction limits (or going around them perse).
Here is a flatbed 3200 dpi scan crop from Velvia 50 (That I shot at 25 and pulled 1 stop as it was expired and I was worried a little).
Here is the same shot, with multi-sample superresolution applied
Similar area shown from some other scanners:
There is more details how I did it at http://rangefinderforum.com/forums/s....php?p=2098918
Only 2 passes are needed to achieve the results from some testing I've found.