… when Distort Vision does it better?

Both are Free Actions, neither are sustainable.

Precog. Dodge only works v. Ranged attacks, whilst  Distort Vision works on all attacks, and is easier to manifest as well as being cheaper (minor power as opposed to a full Discipline power).

Am I missing something?

Nope, you're right. It doesn't make sense. Suggested changes (pick the ones you like :) ):

DV is removed altogether.

DV only effect one enemy, while PD effects all hostiles.

PD works against all incoming attacks.

DVs obfuscating effect is weakened to -10.

The effect of DV is immediatly broken if he attacks, while PD isn't.

PD lasts for Psy rating x0.5-1 rounds (rounded up)

PD can be cast on others.

PD increases Dodge by +30 instead of decreasing the BS of the attackers (or maybe the minor power should increase the casters ability and the major power should lower the ability of the enemies).

I am not sure off the top of my head, but I think the errata changed how the minor ability worked, so it was much less effective.

True, I was referring to the "reduced" version. Originally, it would make you appear 10m beside your actual position, and everyone would miss. Period.

The only upside to Precog. Dodge I can see, is that it lasts until "the end of your next turn", whereas Distort Vision lasts until the start of your next turn. Though I can't think of any situation where that might make a difference.  

I've always played PD to be sustainable and applied it to both melee and ranged attacks- which should make it much, MUCH better.

Not to mention, a piece of gear like Infra-red or anything like that breaks the minor power, whereas the other plays more like an actual Psyker seeing the future and positioning himself as to avoid being in harms way reflexively. 

But I haven't had a Psyker go into that branch yet, but I am planning to have a Psyker kick the group's ass soon, and he's going to have it. 

 Pretty sure that PD cant be cast on anyone other then yourself .. sadly.. I wish there were more powers to use on your group :(

Errata reads as follows:

With this power your physical form distorts and you almost fade from view. Your precise location becomes extremely difficult to discern, and until the start of your next turn all attacks against you suffer a –30 penalty to hit. Characters with the Blind Fighting Talent only suffer a –10 penalty. A successful Challenging (+0) Psyniscience Test removes this penalty for the attacker. Sensory equipment based on standard optical sensors are fooled by this power; ones that read thermal patterns, use motion sensors, or rely on some other form of detection are not. Creatures and sensors that do not rely on sight are not affected by this power.

Enjoy.

If you see post #3 in this thread, I was referring to the Errata version of the power. 

Before the Errata it was even better. But even now, after revision, the Minor Power is more powerful than the more expensive Discipline one.

two words:

they stack.

Precognitive dodge is a reaction while distort vision takes a free action to use, meaning you have to use distort vision on your turn and sustain it during the opponents action while precognitive dodge can be used as your reaction.

Also dont forget that according to the errata "A Psyker may manifest only one ability per Round…" In my group we change that slightly and allow the psyker to use reaction powers even if he has already used another power, so as not to render reaction powers useless.

PnPgamer said:

You can only focus one power each round, and as neither are sustainable, they cannot stack.

Humanas said:

Not so.

From the Dark Heresy Rulebook, p 172
"Precognitive Dodge

Oups, my bad! You are right, Tzeentch tricked me into believing Precognitive Dodge was a reaction.

And yes it is really weak right now, are there any other similar powers in other books so we can compare and maybe rework it ?

Well, sneaking a peak at Only War, the most similar power there would be:

FOREBODING

As far as defensive minor powers go, there is chameleon and precognition plus distort vision. I find the other two to be very effective by themeselves so maybe distort vision needs to go or become a discipline power ?

Darth Smeg said:

weren't that only on the case of attacks/attack type of powers?

Also precognitive dodge can be useful when trying to get into discipline mastery (which also reduces its power threshold into 6, but doesn't matter at that point anymore) as you need every power in core book to achieve that. Also, precognitive dodge is undisableable. And instead of a pussy that hides beyond mundane sight, you do cool matrix moves.