For those having lens calibration / soft focus issues with your X5... It was happening to me also. I have been messing with my X5 for the past 3 hours and believe I have this lens calibration figured out... sort of. I wish DJI would make a video on lens calibration, but after what I just went through I see why they are not making that video after many requests from Inspire Pro and X5 owners.
1. As it states, make sure you have a high contrast object to focus on at least 50 meters out. I live on a dead end street, so just centered the calibration on a home front about 60 meters out that was high contract. I set my aircraft on my case so the camera was above the grass.
2. I made sure that my aperture was at 1.7 so I could quickly check the results against manual focus infinity setting. At F1.7 if you hit the infinity button, everything should be in focus on the targeted high contrast object 50 plus meters out. If you are in f 8 you might be in focus if you hit the infinity button... this does not mean it is calibrated because of the long depth of field associated with F8.
3. Go to "tool", then "calibration". I made sure that the object I was going to focus on was in center of screen (not sure if this makes a difference). Click calibration.
4. Click OK, it will tell you to tap on the area you want to calibrate on. I found I had to tap on it twice some times. If it beeped and calibration went back to OK it was complete. Click OK again... it will exits calibration mode.
5. I immediately went to Manual Focus mode to see if in F1.7, when I touched the infinity button, things were in focus. They were not. I had read a comment to try repeating the process. I did repeat the process approximately 20 times before... OMF'nG... the focus in manual focus mode was perfect at F1.7 when I hit the infinity symbol.
6. Because I am hard headed I tried for another couple of hours more to see if there was a way to make lens calibration consistently successful. It seems to me to be a purely hit or miss process.
*** Important Note *** from what I can tell the lens calibration resides within the mobile device your aircraft is connected to, so if you use another mobile device from time to time you will need to calibrate the lens for that mobile device also.