NOCTILUCENT CLOUDS (NLC's)
Here are a few examples. Note: the lights visible in the clouds are not UFO's, but internal reflections of the bright terrestrial lights in the lens!
|A nice example of noctilucent clouds taken over Falkirk in August 1998; 2 sec exposure through a 50mm lens at f/1.4.|
|A conspicuously bright display imaged just before midnight on the 13th July 2002. It had been a poor season from my location, but this was a nice event; 3 sec exposure through a 180mm lens at f/2.5.|
|The display above imaged from another location about half an hour later. Note changes in structure and brightness; 3 sec exposure through a 135mm lens at f/2.8.|