5 stars - A must have for photographers ...Seriously !

While the App may seem expensive its actually a great deal. The past several years I used a cinematographers program (that cost several times the Helios App price) to determine sun azimuth / inclinations anywhere in the world, and I never regretted the investment. When combined with a compass and inclinometer I could determine exact sun locations throughout the day anyplace in the world. With this App I can do the same, but it INCLUDES a digital version of a compass and inclinometer (I formerly used a Sunoto that cost a small fortune).

The App is great for determining shadow movements or where the "ball of fire" will be in a photograph. I find it invaluable for determining what order to shoot a list of photographs when I have several to do and want to shoot when the light is best, it allows me to know when the light will be on/off my "subject". A must have for anyone shooting with natural light, especially nature and architecture shooters (you can determine when light will hit the face of a building or be coming through a window) . I also use it to determine call times for future location shoots when traveling. You may want to see their web site for screen grabs of what it does, its a bit hard to explain how it looks / works.

At $30 bucks its a bargain, cheaper than a decent UV filter...and yes I paid for mine.

Werxok about Helios Sun and Moon Position Calculator