Encore - Rainbow Over Piberbach, Austria
March 25, 2017
Today, and every Saturday Earth Science Picture of the Day invites you to rediscover favorites from the past. Saturday posts feature an EPOD that was chosen by viewers like you in our monthly Viewers' Choice polls. Join us as we look back at these intriguing and captivating images.
The photo above shows a jaunty rainbow stretching over a cornfield near Piberbach, Austria. My shadow clearly shows the direction of the antisolar point -- the only direction where rainbows can be observed. Note that the fainter secondary bow is also visible (at left). This bow is caused by two internal reflection of sunlight in raindrops. Since some light is lost with each additional reflection, secondary bows are only 43 percent as bright as the primary bow. Photo taken on July 21, 2011.
Photo Details: Canon EOS 550D camera; ISO 200; Peleng 8mm fisheye lens; f/8; aperture mode, corrected by -1 stop, resulting in 1/60 sec. exposure.