Where are my Photos?

Sunday, March 31, 2013

Time Lapse - Night Sky

We went bush camping again for a couple of nights over Easter.

I was keen to try our the new CamRanger (CR) with the 1D-X doing some time-lapse photography.

One of the great things about the CR is the ability to view the image live on the iPhone, so getting focus is much easier than the sometimes awkward angles you get in to see the screen whilst pointing the lens to the sky.

Hooking the CR up is so simple. Plug the USB into the unit and the camera body. Switch it on, connect the iPhone to the WiFi hotspot created by the CR and volla! live view on the iPhone.

I fitted 24-70mm L Series Canon glass to the Canon big gun and did a couple of test shots to get the right exposure.

I ended up using ISO 8000, F8 to get a 20" exposure. Any shorter than 20 seconds and you need a higher ISO, any longer and the stars stop being dots and start to become lines due to their apparent movement from the earth's rotation. The f8 aperture was to ensure the trees were in focus as well as the stars.

Next step was to dial into the CR app on the iPhone 300 shots 30 seconds apart - thats a 10 second movie at 30 fps covering 150mins of rotation.

Hit start and wait......

150mins is a long time in the cool night. I had a campfire to keep me warm and occupied. If you look carefully in the movie you will see some sections show a reddish hue on the trees - no doubt when a few extra logs went on the fire.

So why isn't the movie 10secs long? A simple but stupid answer. The camera battery went flat. Note to self. Don't do a long time-lapse sequence with a camera battery on half charge.

Anyway the result is pretty pleasing albeit short.


To produce the movie I export the pics from Aperture to JPG then I use Time-Lapse (available on the app store from Microprojects) to put the pic into a movie. In this instance I have produced the movie in iMovie to add the titles and music etc..

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