Frank Goodin |
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How to Overexpose or Underexpose
Can you tell me if I'm on the right track with this exposure? If I meter a scene at, say, 125 at f8 ... to overexpose would I then change manually to 60 at f8? Or do I have to change the f-stop instead? I'm really confused. Please help, thanks.
April 09, 2004
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John Wright |
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Actually, there are several answers...
The way you describe it in your message is completely accurate. If you meter a 1/125@f8 and then change your shutter speed to 1/60, you will let one more stop worth of light in (1/60 is longer than 1/125 - so more light). This would result in an over exposure. If you wanted to under expose, you could change your shutter speed to 1/250, which is faster than 1/125 and would let one stop less worth of light in.
Saying all that, you could do the same thing with your f stop. Keeping your shutter speed at 1/125 and changing your f stop to f11, you would let one stop less light into the lens or taking it to f5.6 (under exposing), you would let one stop more light in (over exposing).I hope that helps...
John
... Slight correction - my cursor jumped... see below:
April 09, 2004
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John Wright |
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Actually, there are several answers: The way you describe it in your message is completely accurate. If you meter a 1/125 at f8 and then change your shutter speed to 1/60, you will let one more stop worth of light in (1/60 is longer than 1/125 - so more light). This would result in an overexposure. If you wanted to underexpose, you could change your shutter speed to 1/250, which is faster than 1/125 and would let one stop less worth of light in. Saying all that, you could do the same thing with your f-stop. Keeping your shutter speed at 1/125 and changing your f-stop to f11, you would let one stop less light into the lens (underexposing), or taking it to f5.6, you would let one stop more light in (overexposing). I hope that helps.
April 09, 2004
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