Hello -
My tripods and heads, from well known manufacturers like gitzo and manfrotto, are all liberally
festooned with these very pretty lime green bubble affairs.
They look great but I can't figure out what they're for!
Once, when I was standing on a hill in the middle of nowhere (looking down on them from atop
the wooden stepladder I'd lugged up there specifically for this purpose), a passing stranger --
after we'd chatted awhile -- ventured the opinion that they're for ensuring the camera's position
is level.
I didn't like to say anything at the time, but I know this can't be right. They all give different
readings and besides, none indicate anything close to genuinely level.
Does anybody know what they are really for?? I'm very curious.