Scanning Film Negatives With A DSLR – A Maker’s Guide by DIY photography.
Right now I can get higher resolution and better image quality that what street labs give you on CD.
It is not just a matter of photographing the film with a digital camera. There is must much work behind the scene, and given the price and rarity of film scanner, and the performance of even high end flatbed scan with film support like Epson V600 and V700, it might be worth it. I have always thought I good do it that way, but never went the extra effort to actually do it properly. It is probably way easier with black and white.
Remember, slide duplication was done that way, albeit with a specialised duplication film that had some very specific characteristics.
When I build one of these rigs, I’ll let you know.