Let's see your DSLR film scanning setup!

[Harry]

Some other examples of collimated v non-collimated here:

Collimating light for more sharpness

I can confirm, based on my personal experience, that coherent light (parallel rays) is not going to result in even illumination(unless you are using a telecentric lens I suppose, but that’s just an aside) and that you need to focus the condensing optic’s projection of the (point) light source into the optical center of the taking lens. The condenser optics (focal length) should match the focal length of the camera lens, and its size (diameter) should be sufficient to ‘cover’ the negative; in a…