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Forum: General Photography 01-23-2019, 08:39 AM  
What interval does a light meter read?
Posted By victormeldrew
Replies: 10
Views: 603
The long answer is, it depends on what light meter you're talking about... A handheld light meter might offer a few different modes, including instantaneous (flash mode) and average.

If you're talking about the inbuilt meter in your camera, the short answer is that it averages over a period that will even out artificial sources (around the 1/4 second mark), but the issue is not the measurement period, but the shutter speed you are using, which is much more likely to be in the same ballpark as the light source.

The even shorter answer is that the meter movement you are seeing is probably the product of something other than light source. Small movements in where you are pointing it can create large fluctuations, especially if you're using spot metering, or with weighted metering if there is a light source near the edge of frame.
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