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Originally Posted by peacegirl
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Originally Posted by LadyShea
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Originally Posted by peacegirl
So do the experiment at night so there aren't other light sources. It's not that difficult LadyShea, but you are making it difficult because you can't believe that science is in error, therefore all of everyone's anger is focused on Lessans. Do you think that's fair?
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You don't see the difficulty because you have zero understanding of optics, the science of photography, how lenses work, how light works (did you ever look up the inverse square law?), what visual range, field of view etc. refer to in reality, or what resolve/resolution actually means. |
This problem could easily be resolved if an experiment was to be carefully constructed.
The Inverse Square Law - what it means to Photographers
It's useful to know a little about the inverse square law especially when using flash or studio lights. Basically all the inverse square law says is that an object that is twice the distance from a point source of light will receive a quarter of the illumination. So what it means to us photographers is that if you move your subject from 3 meters away to six meters away, you will need four times the amount of light for the same exposure. This can most easily be achieved by opening the lens aperture two f-stops (see aperture for an explanation) or using a flashgun that is four times as powerful.
What do we mean by a point source of light? Well in Physics there might be a very strict definition but for our purposes any flashgun or lamp can be considered a point source. The other variable to be aware of is that the law works for 'unfocused' light sources. Light from a laser or other highly focused source will not drop off quite so rapidly. |
The Inverse Square Law - what it means to Photographers[/QUOTE]
Right, now do you understand how the inverse square law applies to your experiment construction?