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 2.

No Filters. When shooting into the sun, remove all filters from your lens, even your skylight filter. When a filter is on your lens, the sunlight passes through the filter and may (depending on the angle of the sun) bounce off the front element of your lens and back onto the filter, creating a ghost image of the sun in your frame. Location: Key West, Florida.

Blue in the Sky. A good time to take city shots is shortly after sunset, when city lights are just coming on and while there is still some color in the sky. Location: Miami’s South Beach, Florida.