When setting up your shot there is no tool for visualising this – you just have to estimate and hope you get it right. This means that my photos all lose 15.625% of their height, split evenly between the top and bottom (ie. HD format has an aspect ratio (width:height) of 16:9, whereas the Canon photos have a ratio of 3:2. If you want your final movie to be in HD format, then the photos you are taking will likely have to be cropped at the top and bottom.On the Canon 550D, the smallest picture resolution (“S”) is 2592 x 1728, which is more than even full HD video requires (1920 x 1080), and using anything more than this will simply be resized down during video rendering phase anyway. You may be taking thousands of pictures, and unless you want to treasure and reuse every last frame, there is no point having each photo consume 20MB disk space when it might only 0.5MB might be necessary. Before you start shooting, set your photo resolution mode to low.If you want more than this then you could buy a battery shoe, or if you are shooting from indoors you could consider using an external power adapter – both of which require you to purchase optional add-ons, and are not necessarily cheap. Changing the battery will definitely interrupt the sequence, and very likely also cause the camera’s viewpoint to shift noticeably too. If you render your finished video at a fairly standard 24 frames per second, this will result in a maximum duration of about 60 seconds for a single video sequence. I have found that I can take about 1500 pictures or so with one full battery charge. Unless you have a power supply connected to your camera, the number of pictures it can take will be limited by how long the battery lasts.However, for sunrise or sunset time lapse not quite so well, because as the camera adjust for light levels, the impression of increasing/decreasing light levels are somewhat lost. For weather time-lapse I have found that automatic camera operation works quite well. Depending on what you are shooting, you may or may not want to let the camera automatically adjust to light changes.Make sure you focus the camera before you start the shooting (for example by half-pressing the shutter button), then set it to manual focus. For my first effort I left it on, and the picture jumped in size a lot – not a good result. The camera’s auto-focus control cause the picture frame size to change by small amounts.Later I bought a separate battery-controlled timer device which plugs into the camera and is a much more lightweight solution (shown in photo above). I used this initially, and it worked well enough, although it requires you to keep your computer running the entire time of the shoot.
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