>> But since you comment... take a long exposure of a night sky, and you
>> get quite an impressive effect. Ever see those photographs with 25
>> lightning strikes in the same image? Long exposure. Several flashes
>> captured in a single frame. (This *also* requires special equipment,
>> mind you...)
> 
> Really? My camera can do that. All that's needed is to hold the shutter 
> button down. SLR cameras have been doing that for decades.

Well, yeah, you need a camera where you actually have the ability to 
control the shutter speed. Most cameras don't let you do this at all. 
And even the ones that do, the maximum duration is usually 0.1 seconds 
or something. Not 20 *minutes*...

Hence, "special equipment".

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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