How to set xperia sl camera?

I think you will beable to because you can pretty much take the sound off of everything.  

you could just simply set the phone on silent mode till finishing the capturing.  

I'm on Xperia Pro, but it's probably all ... the Camera app and pick this option: ![Shutter Sound][1] Just set it ...  

... disable the sound of the camera when you take a picture or ...