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09-20-2012, 05:26 PM   #1
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so exactly how much light is -3 EV?

I have been looking all over the net to have some comparison of how much light it would be (new K5II) and can't find anything. anyone have an idea?

thanks

randy

09-20-2012, 05:38 PM   #2
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To properly expose a -3EV scene you would need something like ISO 800, f1.4 and a 2 second shutter.
09-20-2012, 05:47 PM   #3
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Exposure value - Wikipedia, the free encyclopedia
Full moon, so they say.
Something like these shots:





09-20-2012, 07:07 PM   #4
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nice shots there

09-20-2012, 07:54 PM   #5
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EV depends on the ISO setting, though the convention is EV(100). -3 EV(100) is the amount of light that would indicate a 15s exposure at f/1.4 with the camera sensitivity set to ISO 100. To get a better idea of what this means, my K10D has a meter sensitivity of 0 EV(100) and that only barely. The meter simply will not respond to less light. The K-30 requires 1/15th as much light to retain meter functionality.

So, what does this mean in practical terms? How about accurate wide-open metering with relatively slow (say f/4) lenses in VERY low light. For those of us that use stop-down metering with legacy glass, it means accurate metering stop-down metering at moderate apertures in dim light.


Steve
09-20-2012, 08:34 PM   #6
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Here's a helpful chart to help visualize it: Exposure value - Wikipedia
09-20-2012, 08:57 PM   #7
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QuoteOriginally posted by elliott Quote
To properly expose a -3EV scene you would need something like ISO 800, f1.4 and a 2 second shutter.
Putting it into a night-time landscape shooting situation:

30s, f/1.8, ISO80 = -2.9 LV

Since you would not shoot a landscape with that open an aperture due to DOF & sharpness considerations, you'd be operating in Bulb-mode territory:

160s, f/4, ISO80 = -3 LV
320s, f/5.6, ISO80 = -3 LV
640s, f/8, ISO80 = -3 LV

That's dark.

Dan.

Last edited by dosdan; 09-20-2012 at 09:30 PM.
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