S-Video out and aspect ratio

Hi,
I'm think of getting the Apple Video adaptor for use with my Sony Widescreen TV. As I understand it, this adaptor outputs an S-video signal that mirrors the iMac's built-in display.
Will this display in true widescreen on my TV or will it be in a 4:3 aspect ratio? Is there a way of choosing between the two?
Any help would be appreciated.
Thanks

Thanks for the reply. I don't think my question was a clear as it could've been.
What I really want to know is: will my iMac output s-Video that is anamorphic widescreen. i.e. will I be able to fill my TV's screen without "stretching" a 4:3 image?
Or, is the iMac's s-Video out limited to Standard PAL or NTSC 4:3 without support for anamorphic enhancement?
I know that the iMac supports 4:3 and 16:10, but widescreen TVs are 16:9.
Thanks for your help.

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