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Yeah, this is correct I as far as I'm aware
Negs have a shiny side and a less shiny side and the shiny side is the one that is the right way round, as seen from the macro lens.
You can apparently get slightly better results by shooting the other side (back side) and flipping it, or even better by blocking all extraneous light with a just the right length tube that goes from the lens to the neg, but... it's an extra step/more money spent in the process of sharing my photos with people on the internet, so I don't.
I reckon you are all cool enough to get the intent.
shinkuu_kiss
I've also been excluding as much light as possible, including room lighting, but equally problematic is the light box bouncing back from the phone front etc.
I'm convinced that background light can be reflected from the surface of the negative - especially from 'black' areas - possibly reducing the image contrast, and fooling the camera meter.
Keep in mind that my approach is very much a lash-up that owes more to wishful thinking than optical physics.