HI! when I go to ask the wierd lookin dude on my ship and ask him if ive got all the lightsaber parts i need he tells me no i still need a lens, but i have a lens in my inventory do you need some special kind of lens? i bought one, also when i get on the ship it doesnt trigger the cutscene/fight with the blind sith woman either, the screen goes black for a second like its trying to start it but then it stops

well you can't buy one, you need to complete as many sidequests as possible to get that lens. it will vary from planet to planet.

You will have to unlock the lens.. Not just buy it from the camp on dantooine.

yeah i bought my lens from that lady, then got the rest of the parts when i was doin quests on dantooine

Save Jorran from the Jedi Enclave. he will "give" you the lens for a price.

You should of done this Sceptor.

 

Or just threaten him and take it.