OP Home > How-To > Shooting > Chasing Rainbows   Tuesday, April
29, 2014  Chasing Rainbows  How to predict where a rainbow will
be and how to set up your DSLR to photograph it to create
dramatic rainbow-scapes  One practical conclusion from all this
theory is that, in level country, rainbows can't appear unless
the sun's altitude (its angle above the horizon) is less than
42º. At higher solar altitudes, the "rainbow" is below the
horizon. In other words, don't bother chasing rainbows at noon.
Realistically, you're most likely to see a photogenic rainbow
when the sun is less than 20º or so above the horizon. In the
mid-latitudes, that means rainbows are most often seen in the
last (or first) two hours of the day.  If you can see the shadow
of your head, you can quickly estimate where a rainbow will
appear using a measuring tool built right into your body. Extend
your arms straight out and touch thumb tip to thumb tip. Spread
the fingers of both hands as wide as possible, and place the tip
of your left little f