Because taking accurate reproductions of small flat objects boils down to three things: zero distortion, even illumination, flat focus plane. Even if you can fi

Because taking accurate reproductions of small flat objects boils down to three things: zero distortion, even illumination, flat focus plane. Even if you can find a well-corrected macro lens, building the physical setup is a major PITA and you'll still have ugly shadows all over. Scanners have been getting these things right since forever and for next-to-nothing; a 15 year old $300 film scanner easily beats any DSLR film scanning attachment you can find, and not only quality-wise - but especially in terms of ease of operation. If you don't believe me, try "scanning" a document using your camera.