Thursday, July 7, 2016

Circum-horizon Arc

On April 8, 2016 a nice circum-horizon arc appeared. I had seen a similar arc a month earlier, but only had my cell phone to photograph it. I tried a photograph with my phone but couldn't see the arc in the picture, so I took off my glasses to get a closer look at the image.  I was wearing a set of polarized clip-on sunglasses over my corrective lenses and realized that when removed, I couldn't see the arc in the sky either.  I put the sunglasses back on, and there was the arc again. Next, I tried photographing the arc through my sunglasses. The polarized photos were noticeably better at capturing the perceived color. So when I saw a much brighter arc, one that was visible without polarized sunglasses, I took photos with my Canon digital rebel camera with and without my sunglasses over the lens.

Circum-horizon arc with polarizing sunglasses over the lens

Circum-horizon arc using the camera's kit lens as is.

A more professional photographer would probably buy polarizing filters for all his lenses.


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