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Do adjustable length lightsabers exist in Star Wars universe?


I always see blades of lightsabers have more or less the same length (dual blades are double). Why is that?



Can't a longer or shorter length be advantage in some case?



I am NOT expecting infinite length lightsabers (due to energy issues), but have we seen adjustable length blades in the Canon?



Answer



According to the Star Wars: Visual Dictionary and Force Awakens: Visual Dictionary, Lightsabers have Blade Length Adjust knob using which one can adjust the length of lightsaber blade.


Lightsaber manual


Although this shows it in Anakin's lightsaber, Kanan's lightsaber (Star Wars: Rebels TV series) also had this feature.


Kanan's adjustable length lightsaber


(Kanan confirmed this feature verbally in the same scene of Star Wars: Rebels S01E03)


So, the length adjust feature of a lightsaber can be considered norm.



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