Camera Metering System

Where can I buy a telescopic mast (about 10 meters) for under $500?
I need to buy a telescopic mast as used by some amateur radio guys or as used by professional photographs to do elevated photography. The mast that I found on the internet are complete systems ready-to-go suitable for elevated photography and they cost around $5k. I can DIY my own camera pan/tilt head and only need to find a telescopic mast. An air-operated one would be a plus. Thanks.
www.hilomast.com based in florida
Nikon’s Metering System
September 18th, 2009 in
Cameras and Photography | tags: camera, camera metering system, digital camera metering system, exposure, photography, reference, tutorial