I decided to do a time lapse of today’s snowfall at our new place. My new Canon T3i was capable of doing this but, I didn’t have the time to do any test shooting, so I used my iPhone 4S. The wind really started blowing pretty heavily around mid-day and created a lot of melted snow/water droplets on the window, causing the camera’s auto-focus to change for about 20 seconds (several hours real time). Fortunately, most of it evaporated rather quickly and the auto-focus shifted back to the intended scene.
I suppose my only goof was that I miscalculated sunset by about 20 minutes. Next time, I know to just manually stop the time lapse and edit out the last frame or two if needed.
I think I’ll also put a clock outside next time so I can watch the actual time as it goes by. This clip is 2:21 seconds, so every 11 seconds is roughly 1 hour of real time.