I’ve been pondering trying infrared again because I really like the rendering of some images. So I went back and reprocessed some images from 2007.
The 50-megapixel Canon 5Ds R should do nicely (or the Nikon D810 or D850), but for now I need to keep both in color for review purposes, and I can’t afford to buy a 2nd one.
As for myself, I have no interest in shooting anything at less than 24 megapixels (bare, inadequate minimum, 16 megapixels will fill 1/3 of an 8K display, which are coming in a year or two).
If you want the best, convert a Hasselblad X1D to infrared or a high-res Canon or Nikon DSLR. A Sony A7R III would be a fine candidate, but might have infrared bleed issues internally.
See my diglloyd Digital Infrared Photography, still a useful guide and how-to, even if it does not add new cameras—things are pretty much the same, the factors being (a) spectral cutoff, (b) sensor noise, (c) processing techniques. Why don’t I review converted infrared cameras for diglloyd Digital Infrared Photography? Simple—no ROI—it’s a costly exercise and these days I have no wiggle room at all.