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i've tried an old water tank as a way of improving night vision, it works really well! if you've got a nice out-of-the-way place to put an old tank in your yard, then try it! one problem though is that when you cut a section out to make the door the tank becomes rather wobbely, unless the ground and bottom edge of the tank are nice and flat. but this isnt a problem unless it gets very windy.
jarrod.
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