Nope.

No, from the FAQ:

"Focus, evade, and target lock tokens cannot be spent for their normal effect more than once during the "Modify Attack Dice" and "Modify Defense Dice"

steps. For example, a ship cannot spend 2 evade tokens to add 2 evade results. However, a ship can spend more than 1 of each token on different

effects, such as spending 1 focus token as the cost for Calculation and another focus token focus token for its inherent effect."

Spending the first Focus was for the effect even though it did not change dice.

Once upon a time it may have been permissible but the more recent FAQ have closed that window for the Focus token and also for the Evade token. If you have different things to spend them on you may be able to use multiples during a single attack but you can only use it for its standard effect one time per attack.

But its possible to spend focus token when there are no eyeballs? Only for geting target lock from R4.

Hi,

The doubt goes about the using of the second focus token.

Supposing the sequence

-Roll 3 blanks

-Spend focus token, although there is no eye result in the roll

-Get Target Lock (R4 agromech)

-Spend TL

- Roll 3 eyes

May I spend the second focus token from Recon Specialist to modify the roll?

I guess that I cannot.

As others have said, you cannot. But, say that you roll three blanks, spend a focus for a lock, spend the lock, and get hit, hit, eyeball. If you have Calculation, you can spend the second focus to turn that eyeball into a crit. Expensive combo, though.

But its possible to spend focus token when there are no eyeballs? Only for geting target lock from R4.

Yes, and in fact this is a common tactic. If you did not need the focus for your attack, and you cannot attack again, always spend that focus to get a lock for next turn. IE I typically run Twin Laser Turret with R4 Agromech. Especially if I rolled well on the first and didn't need to spend a token, I will frequently spend a token for a lock to either spend that lock immediately on the current roll or to hold the for the next round, so then you have a Target Lock, a Focus, and potentially a second Target Lock all available during the next round. Just keep in mind that you cannot spend two target locks on the same attack roll, or reroll any die more than once.