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I shoot in CL almost exclusively on my X-Pro 2 these days and have no problem getting a single shot. It struck me as being very hard to control at first (coming from Nikon) but didn't take long to adapt to.
It's hard (maybe impossible) to get a single shot in CH, but two is doable with practice.
Every manufacturers cameras work a bit differently, either you adapt or you stay with the brand your muscle memory was trained on.
Getting a single shot in CL is absolutely impossible on my X-Pro2. The slightest, briefest touch of the shutter release results in 2 images — always. I suspect your X-Pro2's shutter was somehow tuned a little differently at the factory. Or perhaps there is some other setting that indirectly impacts on this function.
Continuous means continuous to me, single means one shot, its a design decision at least as valid as Canons IMHO.
Just one of the many differences in the way different makes operate, which one needs to adapt to.
If the camera shoots 3 frames per second, then pressing the shutter for 1/3 second or less should logically result in only one shot, even if the camera is set to continuous. But that's not the case. This design is simply illogical. It totally fails to distinguish between pressing the shutter for 1/10 second and 2/3 second — either way you get 2 images.