Resolution:
Standard rez is 320×240 but some will do 640×480. There is no resolution beyond VGA
yet.
Frame rate:
Aim for 30 frames per second. Most mid-priced cams will do this frame rate these
days. Your internet connection will be the bottle neck on the frame rate.
Internet connection:
You should also check the upload speed on you Internet connection. It is a
fraction of the speed of your download connection. To get an image of 15 fps you
need an upload speed of about 256 kbps.
Price:
The higher the price the more onboard image processing in the camera. So if you
have an old computer go up market on your webcam to take the load off the old
PC.
Your PC’s age:
The older your PC the pricier the webcam you should buy because image
processing will be done in the camera and not on the computer.
Lens:
Typically it is not spelled out on the box but the pricier the cam the more likely it
will have glass rather than a plastic lens. Glass will give you a clean image.
Light sensitivity:
The higher end cams have better performance in low light.
Image:
You’ll get a sharper crisper image on the high end — which is $79 to $99 US
Pan and tilt:
Up at the top end of pricing you’ll get pan and tilt capabilities. That’s past the
$100 US mark.
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