Night vision

To: David Adams <>, Birding Aus <>
Subject: Night vision
From: Maris Lauva <>
Date: Thu, 10 Dec 2015 02:29:13 +0000
Red filtered light in my experience affects neither bird nor beast. I once 
tracked a nesting pair of Frogmouths in this way. I set up camera in daylight 
on a tripod focusing on the nest and reset to manual focus. Once it got dark 
and the birds started to move I'd fire off a flash shot when I detected 
movement against the stars or faint sky. I used red cellophane over the flash 
and the birds did not react. I followed them through hatching and fledging 
(both chicks fledged). I've spotted for Owls likewise.

At the Barna Mia endangered marsupial breeding enclosure at Dryandra they use 
large torches similarly filtered with red cellophane when they take people 
round for the supplemental feeding sessions. Provided everyone remains quiet 
and still the little critters cheerfully frolic around your feet oblivious to 
the light.

From: Birding-Aus <> on behalf of David 
Adams <>
Sent: Thursday, 10 December 2015 8:22 AM
To: Birding Aus
Subject: Night vision

I've tried a low-end device and can offer a few comments:

* It's hard to see things because the depth of field is so limited.

* You're staring at a small, glowing light which messes up your night
vision entirely.

* It's pretty hopeless to scan the environment looking for animals through
a very narrow tube.

* If you can find an animal, some are clearly less disturbed by the
infrared than a torch. Yellow-bellied Gliders are very shy of visible light
but don't seem troubled by this part of the spectrum. Someone posted some
brilliant Glider films here a few months back from down this way (NSW Far
South Coast.) Perhaps whatever videocamera they were using is a better

If you're staking out an owl hole or the like, it can be worth setting up
this sort of gear on a tripod and then using a torch to quickly detect if
an owl is around. If so, you can turn on this gear to get a look.

I'd love to try out some high-end gear and see what it's like.
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