Sorry this is a bit late!
35mm Equivalent Zoom: this is the zoom of the digital camera if compared to a 35mm camera
Aperture Range: this is the size of the opening in the lens, which controls the amount of light that falls on to the 'sensor'. The smaller the number, the larger the opening, so for night time conditions, a smaller number is appropriate.
Digital Media Type: the type of memory card that it uses, as there are a few different types, so if purchasing a new one, make sure you buy the right type.
Digital Sensor Size: this is how many megapixels the sensor has, the larger this is, the larger the picture, and the better the quality.
Digital Zoom: this is how many times the camera can zoom in digitally, however, unlike optical zoom, this decreases the quality, and I would reccomend not to use this feature.
Exposure Compensation: this allows you to change the amount of light coming into the sensor, and increasing by one lets in double the amount of light.
Exposure Metering System: this is how the camera automatically adjusts the amount of light coming into the sensor by a particular place, center-weighted being the object in the middle, or spot being a certain place selected by the user.
File Formats: this is what the camera saves the images/movies as.
Focus Range: how close an object can be to focus in on it
Interface: how you get the images off of the camera, onto the computer by USB, or can view pictures on a TV through AV.
ISO Rating: this is the sensitivity to light, the lower the number the better the quality, and auto means that this is adjusted for you.
Optical Zoom: how far you can zoom with the lens, not including digital zoom.
Shutter Speed Approx: this is how long the sensor is exposed to light, the shorter the time, the less 'blur'.
This is my understanding of these meanings, but I am not 100% sure whether they are correct. Please could others edit these if they feel I have explained this wrong, thanks. I hope this has helped.
For concerts I would reccomend the Canon A510 due to its 4x optical zoom, as you would want close pictures.
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