What is Focus, Focus Critical, and Focus Haste?

I am researching C grade weapons for my Orc. There is a Berserker Blade 2 hander, which lists variations of Focus, Focus Haste and Focus critical. I'm not quite sure what these mean and what the differences are. If anybody could explain this to me, and/or give some feedback to help me decide if any one of these is more suited for my style, I would be most appreciative. Also, if I were to get a one-handed sword, could the Blacksmith in the Catacombs upgrade it to a 2-hander later on, if I so chose?

you can trade it for twohanded sword there. It's samurai long sword for berserk blade.

the weapon SAs for berzerker blade are focus, haste and critical damage. for a description of what these do, you can check the official website.
official site linky (http://www.lineage2.com/Knowledge/enhancements.html)
also, if my memory serves me right, it takes about 250k adena, a level 8 soul crystal, and 333 c grade gemstones. you can add the weapon SA at any blacksmith. you may be able to save a bit of money if u buy the gemstones in rune, since there are no taxes there. this site (also the official site) will tell you what taxes are in different areas.
official site linky (http://www.lineage2.com/community/castlecontrol.html)

I am researching C grade weapons for my Orc. There is a Berserker Blade 2 hander, which lists variations of Focus, Focus Haste and Focus critical. I'm not quite sure what these mean and what the differences are. If anybody could explain this to me, and/or give some feedback to help me decide if any one of these is more suited for my style, I would be most appreciative. Also, if I were to get a one-handed sword, could the Blacksmith in the Catacombs upgrade it to a 2-hander later on, if I so chose?

Berserker blade (Patk 190, Normal Attack Speed.)
Available SA's: Focus (Red 8), Critical Damage (Green 8), Haste (Blue 8)

The [Color #] is the SA crystal color and level you will need to apply the SA to the Sword. (In addition to the Gemstones.)

[Focus] is simply an increase to the Critical attack rate of the sword. For most people this is simply *the* best SA for most weapons. (Due to how crit buffs stack.) Blunts are about the only weapon where Focus isn't all that great due to the low starting crit rate. Stratics lists the Focus SA for this weapon as being an increase of [73].

[Critical Damage] adds a set amount of Patk to the swing when you get a Crit. So instead of Doing 2X damage on a crit. You do 2X+SA damage per crit. Listed boost for the Berzerker is 270 patk on a crit. Thus if you have 600 patk and crit is thus 1200 patk, with Crit.Damage you would have an effective patk of 1470 *When you Crit*. (Increase of 22.5% in damage.)

Assume 120/80/40 is the Dagger/Sword/Blunt crit rates. This correlates to roughly a 12%/8%/4% crit rates Thus a 71 increase is roughly a 7% increase. Thus adding Focus can give a sword the crit rate (base) of a Dagger if not slightly better. 8+7 = 15. (You don't have the crit passives that dagger classes get though.)

This works out like so.

1000 Swings 8% crits (100 damage each swing) = 108,000 potential damage.

1000 Swing 8% crits with/Crit Damage (245 on crit) = 111,600 dam.

1000 Swings 15% crits with Focus = 115,000 damage.

[Haste] is the last SA option. All it does is increase your attack speed by a set amount. (7% in this case.)

Using the above we would see this.

1070 Swings and 8% crits with Haste = 115,560 damage.

Now, while Haste looks good, having a very slight edge over Focus, you have to remember that there are more buffs that increase crit damage and rate than there are ones that increase attack speed. Plus (rate/damage) is already 2 stat/buff targets versus 1 (atk speed) AND you can raise your attack speed fairly easy with Alacrity and Swift attack potions...things you can't do for your crit rate/dam without a buffer.

also, haste is more expensive, it takes more ss to do basically the same damage as focus would do. nice calculations tho painamplifier ^^

if the critical increase and the speed increase are equal percentage increases, haste is better as long as crits are under 2,1 in power (for dmg over time, disregarding all other variables) but with any crit power buff and the focus outperforms haste pretty quickly

And considering you can get crits that does 10 times the damage of normal swings with buffs (ok this isnt easy to do, hehe) focus > haste, and its cheaper

also, haste is more expensive, it takes more ss to do basically the same damage as focus would do. nice calculations tho painamplifier ^^

HaHa! Forgot about that until you mentioned it.

I tend to level with minimal shot usage when solo since I am trying to maximise cash income. As an OL with a pet (His food is my biggest expense). I don't carry SS because of weight issues. (I carry robes AND Heavy) And when partied SS's on my low patk (Most mobs I end up against because everyone else is higher than me are Blood red.) doesn't add an appreaciable amount of damage. (So I just carry BSPS instead.) Also until C5 hits our heal doesnt benefit from SpS, buffs dont need em, and most seals/drains are a waste of MP. Sleep and the occasional root/silence get the BSPS, but everything else is pretty much the same with or without.

HOWEVER. Since 99.9% of everyone else out there (besides the mechanical ones.) practically has a Shot IV feed to their weapon, yes you should also consider Shot useage.

So, since Haste just makes you swing faster you will use the exact same amount of SS per swing...you will just use it faster. In a group, this means the faster you swing compared to everyone else, the more adena in SS your using.

For Crit.Damage and Focus however, Every additional time you Crit the Shot usage means you get yet another damage multiplier bonus.

So [Crit.Damage] would be 2(2X+SA) while Focus would be 2(2X).

Lets see if my math holds up again.
(3x SS use on Berzerker Blade)

[No SA] = 1K Swings 8%Crit + SS = 216,000 (3k SS)
[Crit.Damage] = 1K Swings 8% Crit + SS = 223,200 (3K SS use)
[Focus] = 1K Swings 15% Crit + SS = 230,000 (3K SS use)
[Haste] = 1070 Swings 8% Crit +SS = 231,120 (3210 SS use)

210 SS @17a = 3,570 adena.

Without buffs the Haste costs a bit more over time for a hair more damage. Once you buff up with those crit buffs though....

(If your a Tyrant spamming SS...might want to pick the Totem that lets you hit harder...not faster.)

Thanks for the level of detail in the replies. Like PainAmplifier, I like to minimize the use of SS, so if I have a choice, I will go for the Focus SA.

also this applys to all other weapons like duels
thats why i cant understand why anyone use rater Kesh*Kesh instant of lets say a good enchent B duels with focus ability sinds they own in PVE thats why no A duels exist with focus :)
NCsoft loves to have people with 1 mil atk speed sinds you use a LOT more SS then be slow and hit with same amount of damage but cheaper meaning less adena sink