Can the FS100 use the SELP18200 servo lens that came standard with the EA50 camera?

Not sure if you are planning to buy a fs100 but I saw today the fs100 is offered new for 1600 dollar, quite a bargain, even for an older model.

Yes, the SELP18200 works on the FS100. I used it for a day then sold it for the SELP18105G. The slow zoom and very long extension are what bothered me most.

I thought the SELP18105G didn't work on the FS100?
It gives distortion, not?

The FS100 does not have correction for the 18-105, but I never noticed the distortion. I am not a pixel peeper, so take that with a grain of salt.