Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Does the lens extend and retract when focusing or does it stay contained within itself?
Document: It's small and non-threatening. It has a close focusing distance as well, so if you really want that up close portrait where everything but the eyes or the lips is thrown into a dreamy background, this will deliver that in spades.This lens (along with the 23mm 1.4) made it possible for me to switch, confidently, to an entirely new system with a smaller sensor, so while the price may intimidate some people, for me, it's a bargain.
As a former owner of the spectacular Canon 85 1.2L! Fuji has created its match. Faster focusing ofcourse than the canon with razorthin depth of field when you want it, if youown an x series camera and are serious about portrait length lenses, grab this. The colors are pure Fuji and the bokeh is exquiste. A good deal at its price.
In a nutshell, not reliable enough for wedding work. So, I eventually caved and dropped the big bucks on the venerable Canon 85mm 1.2L II, otherwise known as the king of kings in the dreamy, bokeh-laden land of fast lenses. Now, the word "fast," as you've likely heard, merely describes it's light-gathering ability, because when defining it's focusing speed, this is an entirely ironic word. It's dog slow, it hunts.
I rented and XT-1 and a 23mm 1.4. I am not lying when I say that within a few hours, I was taking pictures of my 5D MK II, my 6D and my Canon glass and putting it on Ebay. Rash? Perhaps, but as soon as I dumped those 23mm 1.4 shots into Lightroom and saw that they were tack-sharp and the dynamic range was insane, that did it.
This is a must own lens in the fujifilm xf lineup if your even a tiny bit interested in owning a telephoto lens.
I loved it, to a degree. It was wonderful to hold, to shoot with. It was unobtrusive and didn't scare anyone. But the lens was only good, not great.
Love this lens. Lighter than my canon 85 1.2 and incredibly sharp at wide open (unlike the Canon). You won't be disappointed.
What a beautiful lens....... !!!! !Awesome bokeh, very sharp even at 1.2, very fast in term of speed and autofocus.I love everything about it .
If you want sharp pictures, razor thin depth of field, or incredibly sharp pictures with a deep DOF, get this lens. Fuji have outdone themselves here.
I love this portraits lens.. As far as I can see, there isn't any distortion. Well done Fuji. Now I just want an xpro 2 (medium format)
Answer: It stays contained