Infinity question

[moshi]

I am making a light sorc and am in the process of acquiring the runes for infinity however I am getting mixed views on how the thing actually works.

1) Does the sorc have to wear the infinity to benefit from the -lightning resist or is a merc with it on fine?
2) Do majority of light sorcs wear infinity if thats the case? Most of the guides I read have them on the merc.

[krischan]

The sorc has to wear it in order to get the -lightning res bonus. There are a few sorcs who do that, but it's usually worn by the merc. The conviction aura lowers enemy fire/lightning/cold resists (not poison resist) for any attack, no matter who wears it.

[minuses]

However infinity does not break all immunes. Most light immunes can be broke because light immunes usually have under 117% light resist.

[Kijya]

1) You should have a look at this guide (http://diablo.incgamers.com/forums/showthread.php?t=658719), it'll explain the details.
2) Most use it on their mercs I'd say. Using it on yourself gives you a great -elr boost, but it's harder to get the fcr and/or mf to the levels you want them to be.