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4/21/2011

Taking the Lag Out of Shutter Lag

In technical terms, the interval between the time you press the shutter button and when a pocket-size camera or smartphone actually snaps a picture is called “shutter lag.” In practical terms, that means every family photo shows a group of people yelling, “Take it already!”
Shutter lag comes from the fact that point-and-shoot cameras need one light sensor to serve two purposes. One is to show you what you are shooting in the camera’s LCD screen. In that mode, it lets in as much light as possible. But when you press the shutter button, the sensor has to reconfigure and carry out a series of tasks — shutting down the LCD, using face detection to spot people in the photos, setting focus and contrast, powering up the flash — before it can finally snap the photo.
The camera industry has worked hard to reduce shutter lag, but there are things photographers can do to reduce it even more. Chuck Westfall, a technical adviser from the camera maker Canon, offered some strategies.
Set the mode. Because focusing is the most time-consuming operation, it is the first place to attack the problem. First, make sure your focus is set to the most advantageous setting, which is called something like “continuous focus.” That means as you pan the camera around a room, it is constantly focusing as you go. It’s the default setting on most cameras, but check to make sure. Continuous focus eats Sony NP-FH50 Battery a bit more quickly, but you always have extra Sony NP-FH70 Battery ready, right? There may also be a setting called something like “quick shot,” “kids and pets,” or “action” designed to decrease shutter lag. It will be in your camera manual, which you’ve been meaning to read anyway.
Halfway depressed. There is a also a motor skill you have to develop. “The really important thing to do is depressing the shutter halfway to get all of the focusing out of the way,” said Mr. Westfall. When you press the shutter button halfway, the focus and exposure lock, so the heavy lifting is out of the way. When you press the button the rest of the way, all that is left is to shut off the LCD and refresh the image. “Once you develop that technique, the shutter is almost at S.L.R. level,” said Mr. Westfall.
No flashing. Another big time-killer is the flash, which has to store up power before it can fire. “Depending on the level of the Fujifilm FinePix J30 Charger , the time it takes to build up power to fire the flash can be a few seconds,” said Mr. Westfall. If you don’t absolutely need it, turn it off.
Shut ‘em down. Turn off any other features you don’t need. While each feature does not demand much of the processor on its own, several can add up and slow things down.
Or you can buy a shutter-lag free single-lens reflex camera, which does not suffer from any delays, but cameras like those start at around $500, which could present a different problem.
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next blog: 4 tips to increase rechargeable battery life

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