[idi banashapan]

The size of the file depends on what level of compression the built in processor uses for the JPEGs. Not all cameras are the same.

Your ISO level is the sensitivity of the ccd to the amount of light available in the shot. The higher the ISO level, the less light you need, but bear in mind that it dramatically reduces the quality of the image due to noise and the ccd will over-pickup to compensate for lack of light. ISO levels are used in conjunction with the Aperture setting, which controls the diameter of the diaphragm when open. This also affects the Depth of Field and exposure length (shutter speed). When using a camera on manual settings, these 3 all affect each other. If you just want to point and click, use auto.

The hand symbol does not always mean the camera IS shaking, it's more a warning that camera shake will affect the result. You can reduce the blur by using flash. Most cameras have auto flash levelling these days, which cancels out any 'burning' (bright white areas) on the main subject (depending on your metering mode - the bit that evaluates the light levels within the image).

So, a breakdown;

ISO = sensitivity of the sensor to the light available in the frame. The lower, the better the image with look, but you need to be aware of the exposure level.

Aperture = diameter of the opening which the light travels through to reach the sensor. This determines Depth of Field. the lower the Aperture level, the bigger the hole, the more the background will be blurred in comparison to the main subject.

Shutter speed = how long the blades open for exposing the sensor to the light.

Please note that with compact cameras, although these options may exist, they are really only pseudo settings. Compact cameras merely use software to simulate these effects as all that happens when you press the button is that the sensor is turned on for a period of time determined by the shutter speed setting. In SLR / DSLR cameras, the settings affect physical parameters.

If you need any more help or explanations, please let me know. I'm quite into photography!