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Message: <blockquote data-quote="phillymike" data-source="post: 207096" data-attributes="member: 15642">I don't get the triangle.  I understand the trade between aperture vs shutter speed vs ISO (why doesn't the D5100 have these as dedicated buttons - I reassigned ISO to the timer button myself and use it all of the time).The triangle seems to have the Aperture reversed.  It would make sense to say that a wide aperture is traded with short exposure.  The lower right corner seems to be right (fast shutter / short exposure vs high ISO).Maybe the issue with the figure is that the three factors are not a triangle, but really a 3 dimensional space, in which case a 'cube' might make more sense.</blockquote>