To celebrate the release of my Photo Sundial app, which runs on the iPhone and the iPad, I am running a series here on my blog: Seven Days of Sunrise/Sunset Photography Tips. Each day I'll share two tips from the Gallery section of the app, for a total of 14 images. Check out all the images in the app, which is on sale until September 30th.

Today is Day 7.

Go for Black-and-White. Strong shadows at sunrise and sunset help to produce dramatic images. Those strong shadows can look even more dramatic in a black-and-white photograph. Remember: light illuminates, shadows define. Topaz Black-and-White Effects and Nik Silver Efex Pro are the two plug-ins I use to create my black-and-white images. Location: Death Valley, California. FYI: I'm doing a workshop in Death Valley in 2014. Info on my 2014 Workshops page.

Adjust Your Exposure. As the sunrises and sunsets, your exposure will be constantly changing – quickly. Keep checking your pictures on your camera’s LCD monitor to make sure you are getting good exposure. Remember: your histogram is your camera's light meter.