I just came in from the back yard. I wanted to check things out a little before this winter storm hits tonight. With the RE
goggles (with pagoda installed) I flew the
Mavic 2 Pro over to a buddy's house down and across the lake from me, about 2.5 miles...the
goggles read 4 kilometers. I probably could have gone farther, but I kept getting high wind warnings down the lake so I brought it back. No range issues, certainly, and no signal loss. I normally wear bifocals, but with 4 diopter reading glasses the image is crystal clear. My one criticism of the reading glasses concept is that the corner-cutting that allows these readers to be so cheap is that the lens grinding is primarily in the center part of the lens. Works great for the flying, but some of the menu options on the OSD off to either side are fuzzy. Readable, but a little fuzzy. My daughter is an ophthalmology tech and assures me that if I spend more than $4 per pair I'll get a better-ground lens.
It appears to me that the nominal focal length of the screens in the
goggles is such that the eye needs to be able to focus at about 18 inches. For me, that works out to 4 diopters. Obviously it has to be a non-progressive lens...the whole eyeglass lens needs to be the same grind. I was kind of guessing at the focal length but guessed right. If I had known that the focal length for the
goggles was 18 inches, I could have just gone to Walgreens and tried on readers until I found the pair that let me read small lettering at 18 inches.
These RE
goggles I have are about a month old. Maybe there was a hardware change since that
goggles range thread in the DJI forums was started (October 2018), but I just haven't had any range issues.