I've just been wrestling with this again: DSLR scanning of negatives and soon.. slides. I've used NLP and it's fine. Helps when you're doing rolls of film to speed the process. But it requires LR or PS... and there's resistance among many to that. Not me. I've been a CaptureOne guy, but not above using LR or whatever it takes to shorten the time involved in this.
Three links worth looking more at:
Peter Krogh's site. He's a pro and a 2nd or 3rd generation photographer, and had a lot of archives to deal with, wrote a book on DAM, and does work on this for the National Archives. B&H has a video of his process that runs over an hour. Worth a look. Peter is equipment agnostic... so you'll see a lot of alternatives. Link to his site:
https://thedambook.com/dyp/lights/ You'll note that Peter also builds and sells some slide rigs for digitizing to assure a square-on shoot process... and this hasn't changed much from slide dupe steps years back.
From the LargeFormatPhotography podcast the other day I picked up 2 other links:
There's a 35mmc review of
Grain2Pixel's alternative to NLP which gets reviewed (
https://www.35mmc.com/31/07/2020/grain2pixel-review-photoshop-plugin/ ) as less blue focused and more balanced with the reds. I'd agree with the latter that NLP leaves the reds a bit muted by default. But there's a tendency to think that NLP or Grain2Pixel will do it all for you... and it won't. It's a good start, but only a start. Grain2Pixel works only with Photoshop which I don't have. Link:
https://grain2pixel.com/
Finally, the recent LFP podcast was interviewing
Alex Burke who many may know. I bought one of his ebooks when I began the LF journey, but aside from that, he adheres to a manual conversion process, admitting his preference for control, but also the reality that if you're shooting 35mm or 120 and facing more than 1 to 4 negatives at a time... or at least 8 to 12... you might find it a tad tedious. Yes, but you can usually save a configuration as a "setting" or equivalent and that speeds things somewhat. He outlines his process here on his blogsite:
https://www.alexburkephoto.com/blog/2019/10/16/manual-inversion-of-color-negative-film
For my bit, I've acquired Negative Supply film holders (though their LF 4X5 unit isn't the be all and end all, 35mm and 120 are good). I'm also using a Logan light which I'm not happy with, but will be upgrading that, too. I've picked up a used Kaiser copy stand sold by Adorama, and am loving that given that I shoot 35mm, 120 and LF these days and need the ability to adjust the rig. My conversion process is still unsettled for DSLR scanning.... particularly C41 and E6. B&W is easy with this stuff. Color conversion pends. I'm impressed with what I think I see in Grain2Pixel's review and think he's at least capturing my experience with NLP acurately. Whether the step up from Grain2Pixel will deliver more is an open question. And I may simply find I'm moving back to Alex Burke's manual process. Dunno. Last time I did C41 in quantity, I was using an old Nikon LS8000, but that was waaaaay slow and I'm not going there again.
Hope these links are useful. Good luck!