Images from the pov of the camera. How to tag them?

To clarify, I'm talking about images like post #1896086 and post #1970898; a full-screen image that only shows what the viewfinder sees.
Not images like post #1884885 or post #1355169, where the camera itself and anything not seen by the camera is visible.

There used to be a pov_camera tag but it looks like it was removed some time ago.
So I'm a bit confused on how these should be tagged. Some possible ways are:

• Reinstating the pov_camera tag.
• Using the viewfinder tag only for full-screen images. At the moment the viewfinder tag is used even when it only plays a small role within the image. Like post #2027438 (explicit).
• Tagging these images with viewfinder and pov. But that could conflict with images like post #1499334 where we are looking through the pov of a person that is looking at a scene through the viewfinder of a camera (cue inception sound).
• Some other tag I might be missing...
• Stop overthinking things and keep everything how it is.

Also slightly related: If the viewfinder tag gets redefined, how should images that have this semi-viewfinder thing going on, like post #1674274 and post #1143073 be tagged?

Bullet #2 is how I've always used it. Small role images should be excluded and only tagged with the object (so for your example, just smartphone).

I definitely don't agree with Bullet #3. pov requires a limb or something that isn't just characters looking at the imaginary "camera".