AFAIK L150, but ranged specialization adds +1/4 of its level. So e.g. L100 ranged spec (=25) + L125 rapid fire.
1 stack @L125: 33 focus (also listed on the glyph) 6 stack @L125: 8 focus (regenerating too fast to be sure though)
If you lock it and charge or hover over the stacked glyph, and it shows you... but I don't have that handy atm
Thanks @StarLord. 33 focus seems like it should still be ok. I'll work on it when I'm done with getting Aimed Shot and Flurry to 120.
I feel Aimed Shot is overrated. A charged "normal" attack does almost the same damage as a charged aimed shot (tested 3 months ago, but with a huge spread, especially for crits). I usually go with auto attack unless low on focus, then I switch to manual attack. For skill shots I prefer Multi and Rapid (and Disabling depending on situation). I also think that Ranged Spec has pretty low rewards, might drop it despite being an archer.....
My experience is different. Admittedly I have +26.7% Aimed Shot damage on my bow, and it's at 120, but it is almost my most useful. From SotAStatTrak, I average 220-260 damage with Aimed, depending on the day and where I am (often 6-stacked). Gross damage with Bow often exceeds Aimed (auto attack ON), obviously number of uses is much higher. Piercing shot does well, averaging over 150, disabling not so wonderful, but it does add slowing. Rapid fire is really poor per shot, (28 average) but multiply that by 9 and it ain't so bad. I only use a deck with rapid fire for single mobs (troll); multi shot is better for groups of mobs.
This is what I do and charge my special attacks. From my experience, rapid fire is one of the weakest skills and aimed shot is decent. Anyway, I'm just working on skills to increase my DPS across the board.
I have a +2x% for rapid fire on my bow +10?% from Slipshod Shooter's Sash. For me its way better than aimed shot, but it takes quite some time to fully charge.