A lens filter type thingy is attached to the digital camera of your choice and includes some sort of diffuser, with a slit in the filter ring big enough to allow a film strip to pass through, or to hold a slide.
That's a technique that has been around a long time for 35mm slide copying - a firm called Ohnar produced one to fit a wide range of SLR cameras and it was marketed for many years. They've now produced a digital camera variant, not cheap at £70+ Stg, but if it works it should be a darn sight easier than using a scanner. Amongst others, Jessops also market their own version.
GG