Nikon made one of those adapters for a recent digital full frame camera too, but unfortunately they have not made one for medium format film yet and that’s my main digitizing goal.
One reason to use FF...back in the days of film, there are a significant number of accessories made to precisely position a 135 slide afixed to the camera body with a specific length of tube so that it could be duplicated precisely at 1:1 onto a duplicating camera.
I have not checked to see if today you can find a product that holds slides precisely afixed to a APS-C dSLR for 1:1.6 reproduction of FF film slide
And in fact few folks would exceed 16" x 20" print from 135 for the simple reason of 16.9x mangification of grain!
I was really referring to 12x18" on 16x20" if anything - so about 12.7x from 35mm - which is a pretty standard exhibition size. And often from Tri-X. What matters is representing the film character granularity reasonably accurately/ sharply, not how much granularity there is.
I wrote about the effective limit of 16" x 20" from film neg only because of your comment, "and most of them aren't making 20x24's, let alone 24x36's or 40x60's from 135 on any sort of regular basis. "
I'm still a bit perplexed as to why you seem to be under the impression that people shouldn't be making 16x24" prints from 35mm negs - it has very little to do with the nominal resolution of the film itself by that point, and much more about the ability of the optical system you use (be it enlarger or scanner) to adequately and sharply represent the totality of the negative's characteristics.
Realistically 16-24mp is good enough for most applications that end users need (all the way up to LF too) - and most of them aren't making 20x24's, let alone 24x36's or 40x60's from 135 on any sort of regular basis. The problem is that they need a VW, want a Ferrari, but all too often end up with a Lada...
And in fact few folks would exceed 16" x 20" print from 135 for the simple reason of 16.9x mangification of grain!
The reason I would like to have a full frame digital camera for digitization is that I already have a full frame 35mm slide film copying setup, including an appropriate full frame macro lens, and there really is no practical way to use it with a smaller than full frame sensor.
This is true, but even making a 16-24MP scan of 120 film is enough total resolution that any reasonably executed digital print at most sizes will look good. A 16-24MP scan displayed on a 65 inch 4K TV looks outrageously good. In terms of physical print sizes, that's a really big print.
My slide copier (35mm and 126 only, although I think 828 can be made to work) is an Olympus OM bellows unit with slide copier stage and OM Zuiko macro lens.!...The bellows and slide copier unit deals with all the issues of keeping things parallel very nicely and simply, and it is relatively trivial to deal with the light source.
Now we need 1:1.6 version of the same thing.
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