Exposure triangle explanation please.

Started Jul 9, 2013 | Questions thread
confyushis Senior Member • Posts: 1,072
available light (?)

Tan68 wrote:

I think the best way to build a model of this sort would be a loop of string around the three points.

As the aperture corner is pulled out, the other two are pulled in. If someone locks down shutter by putting their finger on the string, then only the ISO side is drawn in.

If the aperture corner is brought in by using a smaller aperture, there will be slack in the string. Don't want slack so either the shutter or ISO points need to be moved to take up the slack.

This is really a physical model of what I described so I am not impartial.

i suppose the loop of string could represent the amount of available light (?) ... a super bright sunny day could be a big loop (i suppose an ND filter could be a cinched-off section of the loop) and a indoor/night shot could be a small loop ...

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