Hi sorry for that question i just need to no if any one his try Astropad on ipad air 2 Sculpting and Thx 
Astropad Graphics Tablet APP
ZBrush doesn’t work on iPads, so how would you be able to use the Astro pen and app with ZBrush?
Well, It seems to be posible since astropad works like a kind of mirroring from Mac ( then you need one Mac + one iPad )
Here one link from Twitter
https://mobile.twitter.com/astropadapp/status/570711492141686785