This camera app is able to take pictures of a real starry sky. You can take stars of the first magnitude and stars of the second magnitude or less in good condition.
You can also get the pictures processed through more than seventy kinds of image processing filter.
To take pictures of the starry sky, you have only to
(1)set your iPhone camera toward a starry sky on a tripod,
(2)tap the star icon (star1,star2 or star3), (Star1 is recommended.)
(3)release the shutter, and just wait a minute or so.
For star 1, select the pixel that appears brighter for each pixel of the continuous shoot image so that the
brightness of the star in the dark night sky will emerge.
Star 2 raises the brightness tone according to the number of consecutive shots, and makes a bright picture.
For star 3, brightness is added for each pixel of the continuous shooting image and it is very brightly photographed.
Even with the same number of exposures, it will blend brightly with stars 1