>>3917163In the first instance my kike nose was uncomfortable from getting mushed by the camera. So I rotated.
Then I realised people can see half my face while gripped portrait, and know that i'm smiling at them.
This is better than landscape where not only can they not see much face, but the photographer is almost always slouched, poking their head forward in order to eye the viewfinder, and grimacing somewhat from the face mashing that all camera designs seem to necessitate.
Turns out when you are shooting humans who are standing up, or up close... the framing needs to be tall, not wide.
Then I realised that although my nose was free, and smiling at them got good results, but holding a camera in portrait orientation with no grip sucked quite a lot. I was also taking a lot of photos with lenses that had screw-drive AF systems; these eat power. Changing batteries half way through the second day always sucked.
So I bought a grip.
Ultimately its primarily so i can adopt a decent posture and normal facial expression by not crushing my nose. Secondly for the portraiture part. Thirdly for the extra power.