Hi, I'm looking to use multi purpose manual lenses in Nikon mount for NX1 for pictures. Like a 18-200mm from Sigma (because the native Samsung's is too expensive/discontinued) and I'm having problems with the following: 1) how do you set a specific apertures like f/8 if you just have a ring on the adapter? 2) is it possibile to get manual focus peaking always on instead of pressing the "set" button every time?