
Presently, I am using a Fuji XT-1 camera mounted to Pentax screw mount bellows (K&F Concept M42>FX adapter), My lens is a Rodenstock APO-Rodagon D 75mm f/4.0-22 copy lens (39mm>M42mm adapter). All mounted on an ALZO Copy Stand. The light source is a Skier Sunray Copy Box II, which came with film / slide holders for both 35mm and 6x6-6x9 cm film.
I import the RAW files into Adobe Lightroom Clasic, and I use the Negative Lab Pro plug-in for Lightroom to convert my negatives to positive.
The Skier light and negative holders being sold now is version III, which has several improvements over my version II, BIT... I believe the present Skier 35mm negative holder is big enough to show the sprocket holes, which I think is a bad idea.
This is the third or fourth evolution of my setup, and I think it is good enough for me. Sure, I am intrigued by the possibility of a flash as the light source, or a 3-color RGB LED, and maybe a higher pixel camera, or a more solid and rigid copy stand. But I am satisfied to copy my film with this rig for now. (plenty of my results can be seen here:
https://garywright.smugmug.com/Photography)
I have slides form the olden days, and today I mostly shoot b&w. No issues when copying slides and b&w, but when camera-scanning color negatives it is somewhat challenging to get natural looking color on the inverted image. There are many software solutions, but I think it is still accurate to say all of them require a certain amount of time and skill. In other words, we might wish for a one-button presto-chango conversion from color negative to color positive, but as far as I know, we are not there yet.