NR-2   May 18, 2017

This is a more detailed look at the Bonneted Bat Roost NR-2 at the Babcock-Webb WMA.  On projects like this I try to get the most out of each opportunity. Below are the results from four different cameras, each with slightly different imaging technology. 

Sunset was at 20:10. The temperature was 84 degrees F. and the wind was 15 to 23 knots. With that much wind, there is a bit of movement in the roost tree and during gusts the cameras also were shaken. The constant wind created a lot of wind noise, most of it I have muted. 

During much of the recording I had an Echo Meter near the cameras so that you can hear the bats echo locating.  Because of the distance from the roost tree to the cameras, you cannot hear them echo locating in the cavity, but if you watch closely, you can see them doing it.

The first bat emerged at 20:50, forty minutes after sunset. A total of seven bats emerged.


The first video is a slow motion video. It was made with a Sony Alpha 7Sii camera and a very fast f 0.95 lens. This video is made with visible light. While the camera has amazing low light capabilities, it was not able to capture the last two bats to emerge, because of the low light levels. This is the camera that I use to capture Realtime Northern Lights.


The next set of videos were made with a Sony AX53 Handycam in night vision mode. The zoom lens was at its maximum setting of 536mm.

The first video is the short version, just the bats emerging from the cavity. The second video is the long version, showing all the activity at the cavity.



The next set of videos was made with a Nikon D5 camera attached to an AstroScope Night Vision scope and a 400mm lens.

The first video is the short version, just the bats emerging from the cavity. The second video is the long version, showing all the activity at the cavity.



The final set of videos was made with a Nikon D800 camera converted to use the full spectrum of light. The conversion by Kolari Vision allows the camera to record ultra violet, visible , and infrared light.

The first video is the short version, just the bats emerging from the cavity. The second video is the long version, showing all the activity at the cavity.



© Ralph Arwood 2017