Update:

Proof of concept: 29 stacked images, each at 1 sec, ISO 3200, only using iPhone for photos, stacked photos using StarStaX software

Single exposure with iPhone 5 using Night Modes app

66 stacked images over a 20 minute period using unmodified iPhone as the camera

Screen shot of the images loaded into free StarStaX software

Using the headphone shutter (+) volume remote, I manually took 29 shots

iPhone headphone (+) volume button works as a shutter release





Simple binder clip holds the iPhone in position

Bent binder clip with a little athletic tape to prevent scratches

Finally, a way to take star photos and make cool star trail images using your iPhone. This will take true iPhone astronomy and astrophotography to the next level! I learned about a new app called "Night Modes" from Steve Owens' Dark Sky Diary blog. The app takes advantage of the iPhone 5's improvements in low-light, and includes up to 1 second true exposure time (not just simulated exposures). The app promises "15 times more light gathering capability compared to the Camera app!" Night Modes ).Take even longer iPhone star trails using Night Cap with infinite interval photos You have to keep the camera very still while using the app, because the autofocus is delayed by the long shutter. I recommend using a tripod and the headphone volume shutter button, but you can also set the phone on the ground and walk away because the app includes a timer up to 10 seconds.I'm not usually the type to make excuses, but the severe wind advisory could be a reason why my star trail lines aren't smooth.Here is a look at my set up: