Hi, folks
Ok, lets talks some ergonomics here: I never considered myself a big guy with tennis-racket hands, but I can easily rest the 505 like God and Sony intended it to be - Portrait

- in my right hand, with or without the cover.
Most of the time, I spread my fingers under it, with my pinky(?) (the smallest finger) in the bottom to prevent it from slipping. My thumb goes right in the page-turn buttons and the corner fits in the meaty area under the thumb (boy, do I need an anatomy dictionary!). It's so secure I read lying in bed.
Other times, I do a "tweezer" grip, resting the botton of the 505 between thumb and index finger. The tip of my thumb can easily press the forward page in the round button at botton-left.
I tried landscape a few times, but didn't really see its use. At least not with b&w 505. In my REB1200 I use it all the time to read color comics.
Best regards,
void Indigo