What Resolution For Clearer Image?

[basilb]

Should I be looking at 640*480 resolution for a reasonably clear image from around 20m using a 4-9mm lens? PVR card I'm using defaults to 320*240 which I can upgrade to the higher resolution but will it make a significant difference? I'm finding at the moment that features (e.g. facial) aren't real clear at that distance with the lens in telephoto mode.

Thanks.

[basilb]

This is the card which can do 640*480 given a suitable CPU.

http://www.geovision.com.tw/english/product/GV-800.htm

The camera is using a Sony EXview 1/3" ccd chip.

I'm restricted to 320*240 because of the older P4 processor I'm using but will an ability to use 640*480 make much of a difference?

[Guest]

...will an ability to use 640*480 make much of a difference?

it is four (4) times better than 320x240.