TL;DR - The current standing consensus in on post 17. For how we reached these conclusions, please read the posts below and enjoy!
I read a few older posts on this and know this confusion has been around for a long time, and I'm trying to compile an official list of why Deadeye works the way it does to be able to show new players around the local game store. There have been a few headaches from the FAQ and an old Twitter post from FFG organized play that I'm hoping can be cleared up.
So, some of the scenarios that have been mentioned.
1. Omega Ace, Norra, possibly future pilot abilities. They have the option (but not direct instruction) to spend a target lock for some effect. Seems clear that this is a no go, but omega ace was okay'd in the twitter post.
2. Any ship using a primary attack and spending the focus as a target lock for rerolls. An absolute no at first look, as this certainly couldn't be fair for a 1 point EPT to allow focus tokens to act as a target lock, and there is again no direct instruction to spend the target lock.
3. A secondary weapon being fired while benefiting from Targeting Synchronizer. I think this one is okay, but it's come up a few times and has caused arguments. The main argument being are both clauses of Deadeye tied together? The first side is: the attack is treated as Attack (focus) instead of Attack (target lock) and only in that case allows the focus to be spent to fire the missile. Treating that attack as Attack: instead of Attack (target lock) from targeting sync would then require the target lock from the other ship. The other side, and the one I tend to lean towards, is: the effects are not directly linked. Targeting sync treats the header as Attack: instead of Attack (target lock) and Deadeye allows the original ship to spend their own focus to fire the missile or torpedo.
4. A ship with both targeting sync and deadeye, allowing another ship to fire a secondary weapon by spending the first ship's focus token. This case is similar to the one in #3 and I would imagine would follow a similar ruling. The biggest argument that has come up here is which ship is being instructed to spend the target lock? Is the ship with both upgrades being instructed to pay the activation cost of the other's attack or is the ship that is firing the missile being given the option (not instruction) of spending the first ships target lock, and wouldn't qualify to use his deadeye? I think this boils down to does "The friendly ship may spend your target lock" then shift the clause "spend your target lock" to the ship with targeting sync or not?
The headache that started this mess (yes, it's an old post. If there is something more recent, please show me. I don't use twitter and it's very possible I'm missing a ruling.) :
This is then suggesting that "may spend a target lock" abilities and effects are also covered under instructions to spend a target lock. I think more unintended wording here is the last sentence stating that Deadeye replaces target lock with a focus and therefore a focus token = a target lock for all purposes.
The FAQ for what counts as instructions to spend a target lock (page 22) makes this worse, or at least more open ended:
Q: What are examples of game effects that instruct a player to spend a target lock?
A: The cost for a secondary weapon such as Proton Torpedoes, using pilot abilities like Lieutenant Colzet, or spending a target lock during the "Modify Attack Dice" step to reroll attack dice are all examples of spending a target lock. Removing a target lock or assigning a blue target lock token to another ship are not examples of spending a target lock.
This would be consistent with the original twitter post from 2015, make Deadeye more powerful surely (maybe too strong for a 1 pt EPT?) and could potentially allow something like firing a secondary weapon by spending a focus, using a target lock from targeting sync for rerolls, then spending another focus or expertise to change all eyes to hits, along with enabling the prior mentioned pilot abilities.
The community however has been vehemently against this interaction. While I agree with it, I also need a better reason to tell new players than "we don't like it working that way". Is it time to change the public opinion on this one or does anyone have more supporting evidence for the older ruling? Looking forward to the clarifications!
Edited by Jimbawaadded TL;DR