It will be interesting to see and read about your findings. The sphere might be a bit of a task though, and if I were in your situation, I’d try to see what I get with light directed to a projection screen and use that as a backlight. That should work…if your setup holds the negative like a Nikon ES-2 to prevent stray light…which is not the case now, if you’re still using the setup you described in this post:
wow! now we are talking! looks impressive!
Indeed I was able to put filter made from masked film leader and adjust intensity of RGB channels to return light back to the relative intensities shown above.
I definitely don’t understand all details here, but do you need do this process for each and every film or difference will be negligible?
Will have more once I finished prototype.
I’m curious! Gonna be waiting for the new topic on this forum to checkout the results! Good luck man!
I hope that i will need to do this for each brand of film once, don’t know yet. You can easily see that orange mask looks very different for different negative films - for Agfa its almost green and pretty dense. But we will see. Thanks for good words!
I mostly used the same negative films and see different mask densities.
I suppose that you’ll have to balance individually or make do with categories like “dense orange”, “thin orange” etc.
I tried with an iPad as backlight compensating the mask…but results weren’t worth the effort.
Caveat: all those tests were done im 2017/18 with NLP version 2.x and might therefore not be completely representing what we could get with current tech and software versions.