I was playing and my ship had a focus and TL. I fired and got some blanks and some eyes. So I spent my focus then re-rolled my blanks. One of them came up as a eye. My opponent said that I couldn't change it to a hit because I had already used my focus. He said that you should always save your focus for after the TL. I was fine with it. And I always save my Focus token until after I use my TL. But then I saw the Sensor Jammer upgrade.

According to the way the rules have been explained to me (and as I have read the rules)

An attack could go like this.

Attak: roll dice

use focus - change all eyeballs into hits

then use Sensor Jammer - change a hit into a eyeball. Since the Focus Token is already used the attack cannot change the eyeball into a hit.

Is this correct?

The attack breakdown goes thusly.

1. The attack is declared
2. The attacker rolls attack dice
   1. The defender modifies those dice (Sensor Jammer and Elusiveness happen here)
   2. The attacker modifies those dice (Focus and Target Lock happen here).
3. The defender rolls agility dice
   1. The attacker modifies those dice (I don't think there is anything that happens here yet).
   2. The defender modifies those dice (Focus and Evade happen here).
4. Damage is calculated

Now, as far as using your Focus and THEN your Target Lock, they happen in the order that you chose.
If you happen to chose to spend your focus token, and THEN your Target Lock, you no longer have a focus token to spend on your TL result.

So, to answer your quandry, your Opponent was right, but your following logic was still wrong.

My opponent said that I couldn't change it to a hit because I had already used my focus.

He's right, focus is a one time deal. You use it once to modify your dice then you're done.

Is this correct?

No, but that's due to how the timing works.

The Defender modifies dice first. So if they're going to use Sensor Jammer, they have to do so before you use TL or Focus. See page 11 Section 3 in the rules.

So the proper process is this.

Attack, roll dice

Use Sensor Jammer to change a [hit] to [eye].

Use Focus to turn all [eye]s into [hit]s

Focus doesn't last - it makes the change, and then it's done.

Everything else, Draconan covered nicely.

Okay let's say your you have sensor jammers and your opponent makes an attack roll then immediately spends his focus (he doesn't wait or ask for you to use your sensor jammers. I know this isn't according to the rules, but you know it is going to happen.

Can you then use your sensor jammers to change a hit into a focus? Since your opponent was technically in the wrong in the way he ordered the turn, or do you just say, "Well if I had used my sensor jammers when I was supposed to the focuses would have been turned back into hits, so it doesn't matter (don't use the sensor jammers)?

Okay let's say your you have sensor jammers and your opponent makes an attack roll then immediately spends his focus (he doesn't wait or ask for you to use your sensor jammers. I know this isn't according to the rules, but you know it is going to happen.

Can you then use your sensor jammers to change a hit into a focus? Since your opponent was technically in the wrong in the way he ordered the turn, or do you just say, "Well if I had used my sensor jammers when I was supposed to the focuses would have been turned back into hits, so it doesn't matter (don't use the sensor jammers)?

I'd say "Fuss at your opponent for skipping your SJs", and then the latter scenario.

I'd mention that he shouldn't be changing his dice until I had a chance to do what ever I want to do, just because there may be a point in which I want to do something.

But in the case you mention using Sensor Jammers doesn't really do anything.

If it's a focus, it shouldn't be a big deal. He did it out of order, it should be easy enough to just back up to before the focus. Target Lock is a little trickier, but you should still be able to invalidate the roll and put the dice back.

You're right that with Sensor Jammer vs. focus it doesn't really matter, but there are certainly cases where it does. Elusiveness and the new R7 Astromech, for example, both force attack rerolls. It's good practice to get in the habit of doing them in order for the cases that do.

I'd correct my opponent and remind him not to be such a ****** in the future.