Quote:
Originally Posted by astronobob
Another way is to Prepare on site, take a solid exposure, high ISO, Full appeture, and a few seconds, or what ever is needed; to easily see the horizon, Live View is very handy for this too if not too dark, then adjust camera level accordingly, obviously need to again with different compositions 
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The newer bodies make this procedure very easy with an in-camera electronic level.
Not sure which bodies have it, but the 60D(+Da), 5D mkIII, 6D and 7D definitely do.
Not sure if any other makes do(Nikon/Sony etc?), but it is a very handy feature.