What VGA and CMOS means in digital camera and how they differ from mega pixel?

Question

What VGA and CMOS means in digital camera and how they differ from mega pixel?

Answer 1

VGA (video graphics array) is a computing standard and refers usually to a resolution of 640x480 - this is the resolution of a standard definition TV. in digital cameras it's usually refering to the video mode being able to output at standard definition. Older cameras had really poor video resolution and looked terrible when displayed on televisions.

CMOS ( complimentary metal oxide semiconductor) is a sensor type. Its different to CCD (charge coupled device) and is being used more frequently in high end cameras like SLR's as they draw less power from the camera battery than CCD. CMOS sensors though are typically less sensative to light than CCD's similar size. Both sensor types have advantages and disadvantages and niether is significantly better than the other.

Megapixels is simply the number of dots that make up an image. A sensor is covered in tiny pixel sites - each site has a microlens which gathers light and focuses it on the pixel. These pixels make up the image. Usually the lower the megapixel count the larger the pixel site and the better the low light performance so a 6MP camera typically gives a better quality image in low light than a 12MP camera, but the 12MP records more fine detail.

Answer 2

vga is a computer graphics standard. cmos is a type of sensor use in some dslrs and most video cameras. mega pixel the number of dots the sensor reads per inch