I would love to buy an adapter to connect my iPhone to DSLR lenses. I have no idea if this is possible. I hate the workflow on DSLRs.
That's not to mention issues like autofocus.
There were a few attempts to bridge this gap, which attach a large sensor to your phone. The best-known ones are the Sony QX1 and the Olympus Air. They never took off. I think that was due to very poor execution. I though the Olympus Air was close, but had a few complete showstopper issues which made it unusable. A v2 might have done well, but instead, Olympus gave up.
A few cameras are getting improved workflows with interfacing to cell phones, so perhaps we'll get there another way.
Google takes my photos, and sometimes shows me "this day 3 years ago" or a nice montage. I like that.
I like having raw files for that 1% of photos I will edit, but that's a much less important use.
- Camera unpredictably decides a lot by itself in an opaque fashion. I get useful automation for family photos.
- I get a RAW file if I want to decide something different or if I'm printing and framing a photo
99% of the photos I shoot fit in the former category, but the 1% in the latter is about equally important (1 framed photo is worth a lot more than a random cell phone snapshot).
Of course the camcorders had tiny sensors behind fixed lenses, so what was happening was the adapter had a bit of vibrating ground glass onto which the external lens was projecting its image, like a viewfinder, and the camcorder recorded that.
The effect looked very good. Manual focus of course but this was considered desireable. I'm not suggesting this as a commercial solution, I just thought it was very inventive.
Overall not really practical.
Lenses are designed for a specific sensor size. Phones have tiny sensors.