<p>Boris, I support your effort for more pixels. I've done large prints from multi-exposure stitches.</p>
<p>For a high-resolution capture from film:</p>
<p>- Use a dedicated macro lens. For your project, to get 120 MPx, you'll be making several shots. Perhaps 6 shots at 1:1 on a DX sensor DSLR. For the highest quality, you'll want a lens optimized for 1:1; this would be the Olympus 80mm bellows lens or the 75mm APO Rodagon D 1x. The usual macro lenses are optimal at more like 1:3 or 1:4 and normal lenses are way out of their optimum range.</p>
<p>- Or, perhaps you'll make more shots at 2:1 on a DX or FX camera. For this, a macro lens reversed will be pretty close to optimal. I'd be inclined to use a manual focus lens, the 55m f/3.5 or f/2.8 Micro Nikkor.</p>
<p>- You'll have to find a way to illuminate the original consistently, and shift to capture different parts of your original. Also, you'll need to hold the original flat.</p>
<p> </p>