My wife and I both like to go out photographing. We usually have only one DSLR/MILC with us, so we take turns in taking pictures. (Rarely, if we have multiple cameras at hand, they usually have different lenses on them and we also swap when we like it)
Recently a friend of us asked who took some of our photos and we realized a lot of the times we don't really know. Sometimes we can figure it out, like if one of us is in the picture then we know it was taken by the other, or we can check whether we took photos using our mobile phones - as that usually means the other had a go with the DSLR.
I'm wondering if there are any easy to use mechanisms to track who is using the camera somehow. We have a fairly similar shooting style, and use most of the features of the camera. The best I could think of is using the C1 and C2 dials, which is a fairly simple switch, doesn't need too much extra book-keeping, and hopefully we can get the data out of the EXIF afterwards while post-processing. However we do use the C1/C2 presets occasionally, so this would limit us a bit. Also this doesn't work for Video mode which we're also using frequently.
The camera in question is a Sony A7-II, but I'm happy to hear about methods that (only) work on other cameras. I'm also wondering if there are any cameras out that might support this out of the box.