You guys sure are good at making these cameras look ugly! 
(jokes)
(jokes)
greyelm
Malcolm
I use a 49 to 28mm stepdown filter on my X100, it works a treat. You can even get a 28mm pinch cap to complete the ensemble.
romi.gilles
i'm a wanderer
well, if i'm not wanting any flare for an artistic look, then i'll shoot with a hood on. if i'm using the on-cam flash or even the ef-x20, i'm definitely going to take the hood off. and i've always used filters - uv/skylight.
back alley
IMAGES
that green is hard to read on the dark skin version of the forum...
semilog
curmudgeonly optimist
The 18/2 might be the most flare-resistant lens I've ever used. I use a hood probably 80% of the time for mechanical protection.
romi.gilles
i'm a wanderer
sorry guys, it's just that it's hard for my eyes to focus on white legibly on many screens.
fer_fdi
Well-known
I shoot both 18/2 and 35/1.4 without hoods and I like it
Bob Wilson
Established
I was looking at this the other day for the 23 on the x100.
The Pentax hood for the limited 43 works with it's 49mm threads.
Pentax has another similar "Inverted hood for the Q system. It's 40.5mm.
You could get a step ring and use it. It's gotta be a winner to use on the 27.
This hood works like charm on my x100s. Easier to pocket (and un-pocket) than the fuji hood; doesn't block the viewfinder as much, either. Harder to get your sticky fingers on the front element, as well.
GaryLH
Veteran
agoglanian
Reconnected.
When i was traveling in Europe with my X-pro 1, those pushy tourists gave my poor 35mm a beating. I got a good couple dings in the lens hood but it still works fine. I usually leave the hood on both the 35 and 18mm lenses, but I'm ok using the 35mm without a hood. The 18mm I feel really needs one because the front element is RIGHT out in front there.