canberrabirds
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To: | "Perkins, Harvey" <> |
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Subject: | re hide refurbishment at Jerrabomberra Wetlands [SEC=UNOFFICIAL] |
From: | martin butterfield <> |
Date: | Mon, 17 Dec 2012 09:22:48 +1100 |
Isn't the problem that a fair width is necessary to allow optical aids to be swivelled around to get a good horizontal field of view when following a moving bird? To achieve both aims through a single aperture ends up with a window rather than a slot. Surely some one has published research on this? Martin
On 17 December 2012 09:11, Perkins, Harvey <> wrote:
Martin Butterfield |
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