Equivalent Exposures

6 years 2 months ago #570609 by terrythrostle
Hi,
I'm a new member of Photography Talk, my name is Terry. I have about four years experience of digital photography, so I suppose I'd call myself somewhere in-between a beginner and an intermediate skill level. Anyway to push on to the question! I was wondering if there was a chart or table showing equivalent exposure settings? Any suggestions will be most helpful and appreciated.


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6 years 2 months ago #570668 by effron

Why so serious?
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6 years 2 months ago #570669 by Gammill
Hey Terry, welcome to the site.  This should be what you need:




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6 years 2 months ago #571245 by terrythrostle
Thanks, sorry to appear "Thick" But how would I use this, and what about the ISO ?


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6 years 2 months ago - 6 years 2 months ago #571265 by garyrhook
Yeah, that chart needs some explaining.

The subject here is the exposure triangle. Google it. Start reading.

That said, you have three parameters: aperture (f-stop), shutter speed, and sensitivity (ISO). Starting with a good exposure (with whatever values happen to work) you may hold one of them constant, then increase the second and decrease the third. This assume equivalent step sizes across all.

An example using the sunny-16 rule: a basic exposure on a bright, sunny day will be 1/100 s at f/16 with ISO 100. If you decide you need a faster shutter speed (kids playing in the water?), you can do this:

1/125   f/14    ISO 100 - shorter shutter, larger aperture
1/160   f/13    ISO 100
1/200   f/11    ISO 100


See what's happening? You are shortening the time the shutter is open but opening the aperture up. If you want to stay at f/16, you can increase the ISO setting:

1/125   f/16    ISO 125 - shorter shutter, faster ISO
1/160   f/16    ISO 160
1/200   f/16    ISO 200


These will all produce an equivalent exposure with regards to light. Depth of field, motion, etc, are different issues.

That chart above is supposed to show you that, with a constant ISO value, if you have an exposure using 1/160s at f/8 you could get a comparable amount of light using 1/125s at f/5.6. The chart is in "stops", or (usually) three steps in adjustments.

Hold one value steady, vary the other two. That's all you're doing.


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The following user(s) said Thank You: terrythrostle
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6 years 2 months ago #571278 by terrythrostle
Thanks Garyrhook. I think the numbers in the chart refer to the Sunny 16 E.V. (Exposure Value) but it doesn't show different ISO values! So possible needs updating? Anyway thanks again for your explanation.


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6 years 1 month ago #571400 by garyrhook

terrythrostle wrote: Thanks Garyrhook. I think the numbers in the chart refer to the Sunny 16 E.V. (Exposure Value) but it doesn't show different ISO values! So possible needs updating? Anyway thanks again for your explanation.


No, those numbers are at a constant ISO. Just pick one, doesn't matter. The chart reflects what I explained above for the fixed ISO value example. Hold one parameter constant, vary the other two.

You're very welcome. HTH.


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