Originally posted by SpecialK Many cameras don't have this "function". I suggest just turning it off, forgetting about it, and learn where the level tool is in your editor.
Originally posted by v5planet I honestly don't agree with this. While you can get away with it at normal or long focal lengths, when you're shooting wide, you will introduce distortions to the perspective when you angle the camera differently which cannot be corrected with a simple rotation of the frame post-exposure. This is especially noticeable if you have a lot of straight lines in your composition, so there have been plenty of times when I've relied on my K-7's digital level to help me compose with the DA15, for instance. Before I figured out the offset for my particular camera's digital level, this lead to a lot of uncorrectably distorted images.
Disagree if you like, but your explanation makes zero sense. You rotate the entire image, not change the focal length or otherwise influence the geometry of the shot. Same as tilting your head slightly - it does not cause buildings to suddenly lean in.
Again, we are talking the rotation, not angling up or down, etc.