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Re: slow response time
Before a digital camera is ready to take a picture, the electronics inside the camera must get ready to capture the picture and save it to the memory card or the internal camera memory.
Press the shutter button half-way (to its first detent) to set the exposure and focus. When the ready light is green, continue pressing the shutter button completely down to take the picture. The picture is taken almost immediately.
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This is most often a problem with either the main board, the lcd screen or a connection between the two. If you need help with that one, the place that you can have it serviced is: www.camerasandparts.com All they deal with are the service for the Canon Powershot cameras. Not expensive at all and the work through them is superb. Hopefully that helps get you in the right direction with it. Good luck
You need to press the shutter button half-way and allow the camera to lock in the focus (it will beep) and then, when the moment is right, press the rest of the way....result....instant picture...no delay.
This is "shutter lag," the delay between pressing the shutter release button and the camera actually taking a picture. This is a common situation with many compact cameras. The camera has to focus on the subject, meter the exposure, and switch the circuitry from displaying on the screen to recording the image and saving it in memory. More sophisticated (and expensive) DSLRs eliminate this shutter lag by having more dedicated hardware for this.
With a compact camera, you can reduce the shutter lag by anticipating the shot. Press the shutter release button halfway to focus and meter the exposure. Continue to hold the shutter release button halfway until the right time, then press it the rest of the way.
There is a diaphram between the shutter button and the shutter that does the focus. Pushing the button half way down pre-focuses and then the picture is instantanious. If the diaphram is broken it take a while before the shutter takes the picture. One of the AA batteries may be defective so try another set and see if that is better. There is also a slight possibility that the secondary battery (hidden within the camera) has gone bad.
There are a couple issues related to "slow" that I have with my C-750, and this is how I get around them.
One is the write speed to the xD card. This can prevent you from taking sequential pictures quickly, as the camera displays the current picture it is writing until it finishes. You can make the image of the current picture go away and use your viewfinder again, while the camera is writing the picture, by pressing the shutter button halfway and releasing it. Then you can see your subject in the viewfinder again!
Second is the delay between the time the shutter button is pressed and the time the shutter actually opens (when the camera actually takes the picture). This can be fixed by lining up your shot and pressing the shutter button halfway and holding it for a few seconds. This will give the camera time to adjust and lock focus, shutter speed, etc. There is a small green dot on the display below the battery indicator which will blink a few times when the button is pressed halfway, then remain on steady. When the green dot is steady, the camera is ready. Press the shutter button, and the camera should immediately take the picture.