Changing Perspective

There are many factors that play into the success or failure of a photograph – the subject matter, the time of day and weather conditions to name but a few. One of the less obvious of these is perspective. Perspective has a huge effect on our compositions, but it's something that many photographers don't give a lot of consideration to.
There are many ways to alter perspective – shooting from unusual angles, getting higher or lower being some obvious examples. What I'll be focusing on here is the use of different focal lengths along with specific framing to achieve different results.

The Dark Hedges, Antrim
Canon EOS 5D Mk. II, EF 70-200 f/2.8 IS @ 200mmf/16, 1/2 @ ISO 100
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What is Perspective, Anyway?
The definition that we're interested is this:
perspective:the appearance of objects relative to each other, determined by their distance from the viewer.
The important thing to remember about ...