I said I was coming up with a cut of Ben's Hut scene that had no flashbacks -- well, here's the script for it. It will require clever editing using coverage, non-synch dialogue, alternative angles created by masking Full Screen shots -- whatever tricks we can pull to cover this. But it's all taken from what's there and covers the bases: Luke's father turned to the dark side, became Vader, and hunted down the Jedi. The remaining point which would be made later in the movie is that Vader/Luke's father is still alive.
Here's the script:
INTERIOR: KENOBI'S DWELLING.
The small, spartan hovel is cluttered with desert junk but
still manages to radiate an air of time-worn comfort and
security. Luke is in one corner repairing Threepio's arm, as
old Ben sits thinking.
LUKE: No, my father didn't fight in the wars. He was a navigator on a
spice freighter.
BEN: That's what your uncle told you. He didn't hold with your
father's ideals. Thought he should have stayed here and not gotten
involved.
LUKE: You fought in the Clone Wars?
BEN: Yes, I was once a Jedi Knight the same as your father.
LUKE: I wish I'd known him.
BEN: He was the best star-pilot in the galaxy, and a cunning warrior.
I understand you've become quite a good pilot yourself. And he was a
good friend. Which reminds me...
Ben gets up and goes to a chest where he rummages around.
As Luke finishes repairing Threepio. Ben shuffles up and presents
Luke with a short handle with several electronic gadgets attached to it.
BEN: I have something here for you.
THREEPIO: Sir, if you'll not be needing me, I'll close down for
awhile.
LUKE: Sure, go ahead.
Ben hands Luke the saber.
LUKE: What is it?
BEN: Your father's light-saber. This is the weapon of a Jedi Knight. Not
as clumsy or as random as a blaster.
Luke pushes a button on the handle. A long beam shoots out
about four feet and flickers there.
BEN: An elegant weapon for a more civilized time. For over a thousand
generations the Jedi Knights were the guardians of peace and justice
in the Old Republic. Before the dark times, before the Empire.
Luke hasn't really been listening.
LUKE: How did my father die?
Ben hesitates to answer, but then--
BEN: Your father... was seduced by the dark side of the Force.
LUKE: The Force?
BEN: Well, the Force is what gives a Jedi his power. It's an energy
field created by all living things. It surrounds us and penetrates us.
It binds the galaxy together.
Ben looks solemnly at Luke.
BEN: Your father was a pupil of mine until he turned to evil. He became
a Jedi named Darth Vader. He betrayed the Republic. Helped the Empire
hunt down and destroy the Jedi Knights. Now the Jedi are all but extinct.
Artoo makes beeping sounds.
Luke stares, lost in thought about his father. Ben rises and
crosses to Artoo and the recorded image of the beautiful young
Rebel princess is projected from Artoo's face.
Luke watches as the lovely girl's image flickers
before his eyes.
LEIA: General Kenobi, years ago you served my father in the Clone
Wars. Now he begs you to help him in his struggle against the Empire.
I regret that I am unable to present my father's request to you in
person, but my ship has fallen under attack and I'm afraid my mission
to bring you to Alderaan has failed. I have placed information vital
to the survival of the Rebellion into the memory systems of this R2
unit. My father will know how to retrieve it. You must see this droid
safely delivered to him on Alderaan. This is our most desperate hour.
Help me, Obi-Wan Kenobi, you're my only hope.
There is a little static and the transmission is cut short.
Old Ben leans back and scratches his head. He silently puffs
on a tarnished chrome water pipe. Luke has stars in his eyes.
BEN: You must learn the ways of the Force if you're to come with me to
Alderaan.
LUKE: (laughing) Alderaan? I'm not going to Alderaan.
BEN: I need your help, Luke. She needs your help. I'm getting too old
for this sort of thing.
LUKE: I can't get involved! I've got work to do!
BEN: That's your uncle talking.
LUKE: (sighing) Oh, God, my uncle. How am I ever going to explain
this?
BEN: Learn about the Force, Luke.
LUKE: Look, I can take you as far as Anchorhead. You can get a
transport there to Mos Eisley or wherever you're going.
Old Ben just stares at Luke without answering...