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Old 05-23-2008, 09:29 PM   #5146
Levitron
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Quote:
Originally Posted by Soundy View Post
It can be tricky with shorelines because the shoreline itself isn't usually straight.

That said, there are often other visual cues to go from. Trees are good - they're usually very close to perfectly vertical (especially evergreens). Flagpoles, buildings, things that are constructed level in the first place - use a vertical line instead of horizontal. With still water, you can usually work from a reflection as well. If the horizon is curved because of barrel or pincushion distortion, like you'll get with wider lenses, you can just use the endpoints of it for your ruler.
That is true. In this case, it's both perspective + distortion. So it's lined up alright, just that you've got those two things in play.
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