I am using a Samyang 35 mm MF lens with my X-T2 & while it works great ( with the viewfinder) , the LCD screen only displays various information , but not the image preview. As a result, I can't compose a low angle shot using the tilt screen. The moment I use a fuji AF lens ( with AF-S or AF-C), image preview comes back to LCD . Any ideas how to fix it?