Night Photography
How do I calculate exposure times for night photography?
My cameras inbuilt exposure meter only calculates shutter speeds up to 30 seconds long. Anything longer and you have to use bulb mode.
What I want to do is set my camera meter to a very high iso such as 3200 so that I can get a shutter reading for the night scene, and then use this shutter speed to calculate a shutter speed for ISO 100 film.
How do I calculate this?
I hope you understand what I am saying!
thanks
Hypothetical meter readings beginning at ISO 3200 to illustrate the relationship:
3200, f8 @ 20 seconds
1600, f8 @ 40 seconds
800, f8 @ 80 seconds
400, f8 @ 160 seconds
200, f8 @ 320 seconds
100, f8 @ 640 seconds
3200, f5.6 @ 10 seconds
1600, f5.6 @ 20 seconds
800, f5.6 @ 40 seconds
400, f5.6 @ 80 seconds
200, f5.6 @ 160 seconds
100, f5.6 @ 320 seconds
3200, f4 @ 5 seconds
1600, f4 @ 10 seconds
800, f4 @ 30 seconds
400, f4 @ 60 seconds
200, f4 @ 120 seconds
100, f4 @ 240 seconds
3200, f2.8 @ 2.5 seconds
1600, f2.8 @ 5 seconds
800, f2.8 @ 10 seconds
400, f2.8 @ 20 seconds
200, f2.8 @ 40 seconds
100, f2.8 @ 80 seconds
Since ISO is a measure of the sensitivity to light of a light-sensitive surface, either film or sensor, each step down the ISO scale means that the sensitivity of our film or sensor has been reduced by 1/2. Since the shutter speed determines how long our light-sensitive subject is exposed to light, our shutter must stay open longer for a correct exposure at a given f-stop.
As you change f-stops you have to remember that f2.8 admits twice as much light as f4 and f4 admits twice as much light as f5.6. The inverse is that f5.6 admits 1/2 as much light as f4 and f4 admits 1/2 as much light as f2.8.
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photography | admin | 
January 11, 2011 6:17 am | 
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