If you see a camera or Cypher that you can't get past, then instead of bothering using a Chaff Grenade that will only effect a limited amount of time, why not just break it all together. All you need to do is simply shoot it with a gun and it will be broken for the rest of the game.
Note: Cyphers do sometimes come back once you've left that area and when you shoot it makesure that it isn't your M9 as it won't work, any other gun will be fine.
More tricks, tips and cheats for this game are right here - Metal Gear Solid 2: Sons of Liberty cheats
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