You can take stars of the first magnitude and stars of the second magnitude or less in good condition.
This app artificially expands an exposure time more than ten seconds by technique of the multiple exposures to take picture of dark starry sky brightly.
The only things you have to do to photograph starry sky are
(1) fix a smartphone with tripods etc. and aim it at starry sky,
(2) tap a "star" icon,
(3) press the shutter of the app and wait for around one minute.
It has HDR(high dynamic range) function for daytime photographs.
You can use more than 40 kinds of filters which make various effects to the photographs.
You become able to use all functions by purchasing a paid version.
The functions of this application are as follows.
(１) Starry sky and night view photography function
This app generates a high-definition photo image based on the plurality of consecutively photographed images of a night view using the most suitable multiple exposure technique.
It sets each exposure in response to Starry sky or night view appropriately.
It combines photos of consecutive shots into one.
(Some models might not be able to set adequate exposure level)
It combines photos of consecutive shots changing exposure with each timing into one piece of photo which is increased dynamic range artificially.
You can set the number of consecutive shots to 1-20.
・Indication of exposure information
It displays ISO level, shutter speed and aperture stop in real time.
(Some models do not display them)
・White balance setting
In addition to automatic setting, you can set the white balance corresponding to the conditions such as an incandescent lamp, fine weather, shade, etc.
You can zoom in or out by flipping down or up action.
In addition to the maximum zoom magnification that a camera permits, it enlarges zoom magnification originally.
In this case, it surrounds the zoom area with green frame lines and let to know easily a zoom position at the whole.
You can select all resolution that a camera has.
(Only in the paid version)
・Camera shake compensation function
It minimizes the position displacement in combining the plural images at the consecutive shots.
The photographs taken by this app are stored in the storage and you can see the list of them on a list screen. (Only in the paid version)
✖️You can delete the image by tapping an icon and choosing an image then tapping a trash box icon.
・Image processing function
When you tap a displayed image, the image is enlarged.
When you tap an editing icon here, it displays a list of filters for image processing.
This app has about 40 filters such as 'Brightness','Contrast','Blur','Sharpening','Sepia','Monochrome','Edge detection', 'Sketch' and so on.
Select a filter from these filters and you can do actual processing to the image on the screen by the selected filter. The image processed can be stored in this app and the camera roll, then you can do another processing subsequently.
You can share photographs in email or various SNS.
This app includes the following open sources.
・openCV(Copyright (C) 2000-2015, Intel Corporation, all rights reserved.; Copyright (C) 2009-2011, Willow Garage Inc., all rights reserved.; Copyright (C) 2009-2015, NVIDIA Corporation, all rights reserved.; Copyright (C) 2010-2013, Advanced Micro Devices, Inc., all rights reserved.; Copyright (C) 2015, OpenCV Foundation, all rights reserved.; Copyright (C) 2015, Itseez Inc., all rights reserved.)
・GPUImage for android(Copyright 2012 CyberAgent, Inc.)
・GPUImage(Copyright (c) 2012, Brad Larson, Ben Cochran, Hugues Lismonde, Keitaroh Kobayashi, Alaric Cole, Matthew Clark, Jacob Gundersen, Chris Williams. All rights reserved.)