Calculate manual exposures for macro with a range of extension tubes. Get optical focal length when using extenders for any lens with any sensor size. Manual exposures for flash based on flash/strobe guide number, distance and f-stop. Get maximum print size for your sensor size at varying dpi. Find out sunrise & sunset time for your location, plus weather, chill factor, wind direction, wind speed, weather forecast, and visibility. See the forecast aurora activity for you location and get your gps lat/long. All this and more with this nifty photographers toolkit app.