If you have a stock of slides, transparencies and negatives that you would like to get into digital form but don’t have a decent scanner then this idea might be exactly what you need. From a very good article from BJP you can get the idea As the article says…….”
It is getting difficult to find transparency scanners in the affordable bracket between entry-level, five-megapixel frame grabbers and the few surviving higher-end desktop machines such as the Nikon Coolscan 9000. Epson’s V600P is one solution, but most flatbed scanners do not offer anything close to the basic quality required for 35mm slide and negative digitising, or for higher-grade rollfilm conversion.
With some DSLR cameras now matching or exceeding the resolution of most 35mm scanners, and medium-format backs of up to 65 megapixels, the demand for forgotten optical duping systems has surged. Photographers are discovering that, if you have pristine film originals still in their lab sleeves, a device like the old Bowens Illumitran or Elinchrom Dia Duplicator can team up with a Nikon D3x, Canon 7D or similar higher-resolution body.”