I think the OVF was necessary for film cameras because film technology couldn't provide image preview other than via a structure of mirror and lens to see through the lens. When light sensitive digital sensors made their way into cameras, the early compact cameras used the electronic sensors directly for focusing , light metering and image preview, while DSLR makers chose to keep their film SLR architectures because contrast detect AF of the CCD sensors wouldn't perform well (too slow) compared to PDAF in SLR cameras. What followed was two decades of using SLR architecture and SLR lens mounts, just because of the unresolved AF problem. Once the dual pixel PDAF was invented on CMOS image sensors, the "on sensor" PDAF problem was solved and there was nothing in the way of dropping the mirror architecture for a direct , more simple camera design. What's now done in FF mirrorless cameras is nothing different from what was done for compact camera right from the beginning, simple and direct architecture, showing the photographer a preview of what the image will be like once captured digitally.
---------- Post added 27-07-22 at 16:19 ----------
Originally posted by volley And when you look through an OVF of a DSLR you look at the picture the lens projects on the mirror. And that is pretty much 2D, isn't it?
I don't think so , because I compared both looking thru the OVF of my DSLR and looking thru EVF of an EOS R, Z7 , GFX50S etc.. In an OVF, in optics, a flat mirror is not a projection screen, the mirror just redirect the light and has no other effect optically. No image projection happens in an OVF, OVF is an optical path like a lens.
---------- Post added 27-07-22 at 16:25 ----------
Originally posted by Rondec Maybe that's the point for those of us who enjoy post processing and achieving a vision for an image
Your reasoning is what's called motivated reasoning. There is nothing you can do with an OVF that you can't do with an EVF. Post processing of a RAW file has nothing to do with using a DSLR or a MILC, you can process RAW files from a MILC as much as you like to do it when captured with a DSLR.