How long can an S-video cable be before the signal is degraded?

I've never seen very long cables for sale, so I assume the answer is under 10 feet.

Anyone know for sure?

I bought a 25' s-video cable to hook up my DVX100 on a Cobra Crane Jib-arm to an NTSC monitor. It worked great. The place I bought it from also sold 50' S-video cables, but I haven't tried that one, and assume the quality can't be that great at that length.

25 feet was fine, though.

Actually you can get S-video cables in long lengths of 50 (http://www.bhphotovideo.com/bnh/controller/home?O=productlist&A=details&Q=&sku=133818&is=REG), 75 and 100 feet. I've used 75' cables in the past without problems. Over 100' or so there might be an issue, so you should consider a line amp for extremely long runs, and keep the cables away from sources of interference such as AC power cords, etc.

Very long FireWire cables (http://www.focusinfo.com/products/ddv/distancedv.htm) are available, too.

On that same note, I managed to get a 25' S-Video cable from an online retailer for 7 bucks as a closeout deal. Good deal if you ask me!

Ken

I've made 125 foot S-Video cables to run from a Hi-8 camcorder (I wasn't going to loan them something expensive) to a video projector hung over center-stage. Worked fine

Be careful with the "bargain" cables. I use them to run s-video signals from a camera to a mixer. About 6 months ago I bought 100' cables on-line for about $25. They felt somewhat light. What I found was an unacceptable chroma shift, distorting colors and image.

I got some better cables from Markertek for about $80/100'. They are much, much heavier and I have had no problems with color.