## 14 August 2013

### Crib sheet: Time-lapse calculation

While on a day long time-lapse shoot today, I wondered about how long my various cameras' card space would last and how much video I'd end up with. I had various memory card sizes. In the past I'd just work it out on the fly but today I thought a quick crib sheet would be useful.

## Calculating video length

(assuming playback is 25fps, as it always is here in Europe)
• 30 seconds interval = 5 seconds of video per hour of shooting
• 10 sec interval = 14 seconds of video/hr shooting
• 5 sec interval = 29 seconds of video/hr shooting
• 1 sec interval = 144 seconds (2min 24secs) of video/hr shooting

## How long before the memory card is full?

(assuming 1.7Mb per picture and actual card capacity is ~90% of nominal capacity)
(1.7Mb is the average file size of 'Medium Normal' quality on the Canon 600D, YMMV etc)
• 30 seconds interval: 4Gb card in 17 hours, 8Gb card in 35 hours, 16Gb in 70 hours
• 10 sec interval: 4Gb in 5.8 hrs, 8Gb in 11.6 hrs, 16Gb in 23.2 hrs
• 5 sec interval: 4Gb in 2.9 hrs, 8Gb in 5.8 hrs, 16Gb in 11.6 hrs
• 1 sec interval: 4Gb in 35 minutes, 8Gb in 70 mins, 16Gb in 141 mins (2hrs 20mins)

## How long before the battery is flat?

Canon (or your camera manufacturer) will have their own claims about the number of shots the camera will make on a single battery. The typical battery capacity in my various Canon SLRs is 1200mAh.
In recent months I've been experimenting with battery technology, and I have a custom-modified battery pack which has a capacity of 6500mAh, and in my tests will last for 3700 shots. I also have a 9800mAh pack which I will test soon.