One of MagAO’s specialties is high contrast imaging in the visible using simultaneous differential imaging (SDI). For this run we bought a new H-alpha SDI filter set, and tonight we really put them to use. This image compares our on and off H-alpha PSFs. These are formed from 1 hour of 45 second exposures. No strehl selection or any other shady tricks.
![patent pending, Laird M. Close](/wp-content/uploads/2014/04/halfa_sidebyside.png)
![choose your site carefully young padawan](/wp-content/uploads/2014/04/seeing_day13.png)
![double super secret](/wp-content/uploads/2014/04/kate.jpg)
![maybe what we need is a space cloud](/wp-content/uploads/2014/04/working_boys.jpg)
![always a nice sunset](/wp-content/uploads/2014/04/alycia.jpg)
![clowns.](/wp-content/uploads/2014/04/burros.jpg)
![Clock strikes twelve and moondrops burst Out at you from their hiding place](/wp-content/uploads/2014/04/moon_dome.jpg)
We close tonight with deep thoughts by T. J. Rodigas: “What I’m worried about is human knowledge after the Earth is destroyed . . . we should beam it up to the space station.”