Yea, what sdj said. Additionally, personally, I’ve had no luck with auto calibration, and doing manual and picking the smallest size is the only way I was able to have success. I posted more detail on that here:
Again, personally, I chose to just remove and leave off the lens hood. I wasn’t comfortable with how close it was to the work given my focus distance, and just choose to wear safety google whenever the laser is on. I think the only purpose of it is to hide the laser a bit.
Also I agree that 6.2 is written poorly and hard to understand. I think all it’s trying to say is for auto calibration 1) take off the lens hood 2) start auto calibration 3) It will either successfully detect the thinnest line automatically, or it will ask you to choose the thinnest line. 4) I have no idea what the lens hood bit is trying to say. I just left it off.