ABSTRACT
At some time new technology will either replace it or offer something different. Presently, CMOS sensors of a reasonable size are solely color CFA models (with a few exceptions). The target, the Veil Nebula, is a popular one, with strong deep red and blue-green emissions. It is located in a heavily-populated area of the Milky Way and it has a dense starfield throughout. Using an iPhone as an aiming device, fitted to the camera’s hot-shoe, it took a few trial exposures to center and rotate the camera to cover the nebula. Some CMOS sensors have the annoying behavior of automatically doing a primitive dark subtraction using the pixel values from a masked portion of the sensor. This conflicts with the traditional CCD calibration processes that have ingrained themselves on a generation of astrophotographers and application developers.
