/ Extendable pole for mounting camra on.
Or shoot and look and reposition.Works well enough when shooting super wide.
All the best.
Mail me if you need any more info, Im sure there are better set ups out there but play around and find one that works for you.. It doesnt have to be expensive either.
A bit of terminology that you could search on is
Pole Aerial Photography
for getting photos like this http://www.flickr.com/photos/26712210@N05/4614184140/
you can buy various masts and booms specifically for elevated photography - these tend to cost mega bucks. Most people usually adapt some other sort of extendable pole to take a camera, this might be a window cleaners pole, painters pole, pool cleaners etc.. or use a fishing pole.
safely getting something the weight of your 5d+glass safely up metres into the air, repositioning and back to the ground again may be difficult - the leverage exerted on the pole by the weight of camera might be too much.
a fair place to look at what other people do including how they mount their ca,era etc is the Pole Aerial Photography Group on flickr:
There's some video, pics and description of the pole setup that Simon Carter uses at:
Like the idea of a sling rigged camera dong though will try that too. Final thought, I've mainly been using my poles to push a strobe out from the camera a is for OCF work I've found trying to camera mount is hit and miss with aiming and subject composition. I think this is more to do with practice than anything else, not sure a screen in feasible, you'd need a very long HDMI cable
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